A bit confusing, as many Apple things are these days.
I haven't tried iCloud Photos yet, mostly because I don't want to pay $4/month (I have over 100 GB of photos). So I'm not sure how it works. But I thought part of it was no longer needing the syncing between the iOS device and Photos on the Mac (do I have that wrong?) so you should be able to delete albums or individual photos on any device after the initial syncing is done.
It's all rather confusing to me, even though my work is programming and I've been a Mac user going back to the LC.
In this particular case, I was trying to help an elderly woman who loves new things, and has an iPad Mini. But her son set up her albums and he did it during a visit and isn't around and she doesn't have a computer herself.
This is at a class I do volunteer teaching at on Sundays. I suppose I could create a new user for her on my Mac and help her sort it out, then delete the new user. Really all she wants to do is remove some photos from some albums because there are duplicates. It's not a big deal. She has 64 GB of storage on her iPad and 42 GB free, so she isn't at risk of running out of space. But I thought if iCloud Photos would be helpful in this case it would be worth the 100 yen/month fee for 20 GB of space for her.
But it doesn't sound like it would help. She has an iPad and an iPhone. But it doesn't sound, from what you are saying, that iCloud Photos would free her from the need for also having a computer to sync with, right?
Thanks,
doug