All that is quite valid and I don't blame you, Apple's secrecy may work for springing new hardware on its competitors (before the supply chain started to leak like a sieve), but it doesn't play well with pros who need longterm security and planning. A lot of time and resources are put into using an app like Aperture, hours of image management and keywording, not to mention all those nondestructive edits which tie you to either Aperture or Lightroom or anything similar. Just as an organisation might standardise on Word and rely on the files being readable long into the future.With that said, I'm a bit jaded and I'd rather not have to deal with version 1.0 bugs and issues, and lack of features. I'm making my jump to LR now, its a safer bet since LR is a known quantity, I know what I'm getting and I have a better feeling that LR will be supported longer then what apple provide.
That is, given their behavior, who's to say they won't change directions yet again a few years down the road and release a new image management app. Am I over-reacting on this? Probably, but my point is that adobe has been consistent in its support and improvement of LightRoom, where as Apple has not.
For me personally, I will happily postpone any decision down the road til I know more of what the future brings, at the very least waiting for LR6 makes sense. There is no hurry as Aperture works fine for me now, and Apple promises Yosemite compatibility.
What I truly dread is having to move my library across to something else like Lightroom without a clean import of all my edits. It is not realistic having to redo even all my top picks, I have a ton of photos I haven't gotten around to organising and keywording as it is.
I experimented with Lightroom when LR4 came out, I used it exclusively for several months to give it a proper chance, but I just wasn't happy, I didn't feel as productive even if I loved it's editing features, but it's auto feature (which I apply automatically on import in Aperture because it is such a consistently good starting point) just wasn't useful for my photos in LR.
For my way of working, switching between adding info to a photo and adjusting on a per-photo basis, then stamping info (sometimes adjustments) across a block of photos taken at the same time, just doesn't work as well in LR. Not for me.
For now, I'd rather forgo the pain of porting everything to Lightroom for all the advantages that gets me in features and continual updates, knowing I feel happier in Aperture anyway, and waiting to see what the future brings.
I do make use of social media (Flickr, Facebook and Instagram), the latter for which I currently export to Dropbox for import to my iPad and tweaking in Snapseed and adding text/watermarks and squaring in Phonto. My family and friends are all on Facebook and like to see what I do, so I cross post there (Sometimes I export from Aperture direct, just easier to cross post via Instagram which is automatic now they own it).
So better integration of Desktop and tablets (and phones) is welcome, some edits for social media is not to make a masterpiece, just to suit the medium. Photos might just be the ticket for that, esp if the apps I use will have plugins to streamline it all in one spot. IPhoto on the iPad was never useful to me, Snapseed is just much better for quick edits currently.
Moreover I have a Wifi card for my camera which I at times use when I'm out and about to import into my iPad, do a quick edit, then send to someone, perhaps send to Instagram. Advanced editing and Raw support in Photos would be most welcome, syncing preliminary edits to picks in the field back home when connected to Wifi.
I choose to be optimistic and adopt a wait-and-see attitude as there is nothing inherently wrong with my current workflow, even if I am currently envious of some of the editing capabilities of Lightroom, if not it's workflow and metadata management. I have PS cs5 (non-CC thank you) with Nik plugins for further edits if needed. Not ideal, but it works.