Indeed. Have many years worth of photos on my phone (also backed up elsewhere ofc), well above 10k, and it has no problem browsing them. Many others bog down on this.

Love being able to browse so far back without having to go over internet (google photos or dropbox or ...).

Me too. It's a gallery app, but has "file manager" functionality easily available in the UI. I can rename files, move them to different folders, or create a new folder. I can't do any of that on the stock Samsung Gallery app, so I frequently lose track of images and have to look through the entire gallery if I want to find something.