I don't get the deal with camera roll? It's exactly the same as the photos tab but with less organisation
Other people have different concerns, but for me the camera roll view was much cleaner than the years / collections / moments view is. I don't use my iPhone as a photo album, I use it as a camera. The vast majority of the pictures I take with it are quickly deleted off of it - they're saved (automatically thanks to photostream and iPhoto) to my Mac Mini and some of them, based on use-appropriatness, are saved on one or more of my other iOS devices. The point being, at most times I only have 20 to 50 photos on my iPhone. In part that's to save storage space but primarily it's to avoid the clutter of having lots and lots of pictures on my iPhone. For most of the pictures I take, I just don't need them on my iPhone - I have no use for them there, though I do have use for some of them on some of my other iOS devices.
So anyway, I can understand where for some people - e.g. those that keep a lot of pictures on their iPhone - the moments view makes sense. Perhaps it makes it easier to find particular pictures. And the look is more filled in, meaning they probably have a lot of pictures in each of the date / location subdivisions. But for me, that view is bad - there's a line of text and then one picture and a lot of unused white space, and then another line of text and then one picture and a lot of unused white space, and then another line of text and 2 pictures and a lot of unused line space, and so on...
I have to scroll down quite a bit to get to a given picture even though I only have a few pictures there. With the camera roll, all the pictures are right there together - with no or minimal scrolling - and there isn't all the extraneous mind clutter. To me, mind clutter (e.g the unwanted, for me, text in the moments view and the unused white space) isn't good. It makes for a less aesthetic look and it reduces efficiency. A good UI should present the information that is needed or wanted and nothing more. Making a UI to be used for many people obviously means that, in at least some aspects of it, it will be less than ideal for many of those people - e.g., in this case, plenty of people probably do want the extra information (i.e. dates and locations) that's shown in the moments view. For them it isn't clutter. That's fine. But for me, and others, it is clutter. So it makes for a less desirable UI for us.
All that said, that aspect of the situation - what the views look like - isn't the important one. For me, having both a camera roll and a photostream album - which function independently - is desirable for other, more substantive, reasons. As I said, I don't use my iPhone as a photo album. I don't want all of my pictures on it. The same is true of my 3 iPads - I don't want all my pictures on each of those, I want different kinds of pictures on each based on what those respective iPads are primarily used for. Photostream wasn't originally billed as a permanent back-up or a way to keep the photo albums on various devices synced such that they were all the same. It was billed as an easy, automagical, way to move photos between devices - at least, that was part of the sell. And that's how I've always used photostream, and it's been doing a fabulous job on that front.
I take whatever photos I want without concern for storage capacity or clutter or having to move those photos around or whether or not I'd want given photos to remain on given devices. Then, most of the photos I take are deleted off the original device (typically my iPhone). They remain in photostream though, so the next time I'm at my Mac and think about it I can open iPhoto and there the photos will be - and they'll be permanently saved in iPhoto. Further, the next time I pick up iPad 1 or 2 or 3, I can save any photos from photostream that I want on that device to that device's camera roll. Eventually I'll delete old photos out of photostream. But the point is, I don't want all the same photos on all my devices. Most of them I don't even want on any of my iOS devices, I just want them backed up to my Mac (and then with Time Machine). And I don't want to have to make sure that I've saved particular photos - those that I might want there - to each of my devices before I can feel free to delete them from the original device.
I don't want a photo syncer (or a cloud-based photo backer upper), I want a convenient photo mover - and that's precisely what photostream was. It worked splendidly. Whatever photos I wanted were saved on each of my devices, and deleting them from one device didn't affect the others. As best I can tell - and I experimented quite a bit - as things are now with iOS 8 I can't take a bunch of photos on my iPhone and then delete them from my iPhone's permanent storage and still have them available for my Mac to archive and my other iOS devices to save later. From my perspective, that means the photostream function is broken. For others perhaps, it means the photostream (or now the iCloud Photo Library) function is fixed. So be it, to each his own. But based on my recent inquiries, the way I use photostream is quite similar to the way most of my friends and family use it - at least, most of those that have multiple iOS devices and use photostream.
Anyway, I look forward to the old functionally returning (as an option) with iOS 8.1. At least, I hope it is returning. Can anyone confirm that, not only is the camera roll there and functioning as it used to, there's a separate photostream album and deleting pictures from one doesn't affect the other?