Is moving a photo to another album still not possible on ios15 in 2022?
Thanks.
Thankfully, they haven't changed the way photos are organized. There is a single copy of all photos. You can apply whatever tags (ie. album names) to you want to any photo so that one photo can appear in multiple places while still only requiring a single copy of the photo.
You will always be able to see all photos on your device in the 'camera roll' section. You can always add any photo to any album, and to as many albums as you like.
If you don't want to see all the photos at once, just don't go into the camera roll, but instead stick to the albums you've created.