The filters have been designed as temporary filters to revert automatically, probably, because people tend to forget that filters are applied and wonder about missing photos.
Are you using iCloud Photos? Then there is another way: The iCloud Photos Library can be split into two separate compartments - a personal library and a Shared iCloud Photos Library and we can really move photos between these two separate compartments. I am moving my best photos, that I organized in into albums from my personal library to the Shared iCloud Photos Library and are leaving the cluttered mess that still needs organizing in the personal library.
Once we have set up the Shared iCloud PHotoslibrary there is a neat switch where we can toggle between the Personal Library, the Shared Library or viewing both libraries together. When I want to show my photos to someone, I set the View to "Shared Library" and only the curated collection the Shared library will be visible, see: Using the Shared iCloud Photos Library to have two separate libraries on all devices - Apple Community
I like the Shared iCloud Photolibrary very much, but do not use it for sharing, but enjoy it for having two separate views of my iCloud Photolibrary on all devices, my iPad, iPhone, Macs and Vision Pro.
The photos we move between the shared library and the personal library will remain in the albums, but only for us. If we use the Shared iCloud Photolibrary for sharing photos with others, the other participants do not see our albums, only the shared photos.