FWIW, I don't find using iCloud Photo Library to be the least bit slow, and I've certainly never had to "take hours of my time uploading" (I'm a little mystified and curious as to what that might mean), I take photos, and they upload automatically, within seconds, to iCloud. Currently Photos is using 8.2 GB on my iPhone, and that gives me immediate access to the roughly 48,000 photos and 800 videos in my library.Using clouds is not only expensive but painfully slow. I tend to have my iPhone memory full and it''s a pain having to take hours of your time uploading. With SD cards you can move 1000 photos in fraction of the time. Ideally iPhone and I pad should come with SD crd slot like the Samsung. A cloud is a lovely idea but a pain in practice.
The only time I have a problem is once in a while (not every time) when I take a picture on my iPhone and immediately want to edit it on my iPad, the photo hasn't sync'd up to iCloud and back down to the iPad yet. Often times this works, once in a while it doesn't. And in that case, it's a bit maddening that Photos doesn't have any way to say, "no, really, sync now - try again." On a couple of occasions I've simply exported the image to Dropbox and then imported on the other device, but I shouldn't have to resort to this. But 99% of the time, everything works exactly as it's supposed to, and I'm happy that now I can have remote access to my entire photo library, rather than picking some albums to sync via iTunes to my phone and invariably not having the photo I want. I find the cloud quite lovely in practice.
Given that Apple has clearly gone in the cloud direction, I think the chances of seeing SD/MicroSD card slots on the iPhone and iPad are vanishingly small. And I think this Lexar card reader is an excellent path to such a slot for those who really need, or want, one.