What do you think about me deleting my Facebook account which will erase many of my ex-wife's favorite photos.
Do you know if she has saved copies of them?
Maybe, but I don't care.
If she didn't already save the photos, it isn't your responsibility now that you are divorced. If you are more comfortable deleting everything, that is your right.
It's fine, she doesn't want to be around me anymore so I'm going to show that I don't need her shit.
It sounds like you already came to the right conclusion for yourself.