Interesting perspectives.
When it comes to trimming photos, I figure it is a lot like a strip card. When I see a photo with original borders I would want it to stay that way
but when it has already been torn or damaged, I will consider getting rid of the damaged part because I don't particularly relish the look of a photo with this sort of damage:
I haven't cut this one but I could see the reasoning, especially if you don't frame photos for display and just want it to look nice in the album.