Keeping lots of photos is easier than whittling them down to some percentage subset.
I am a big proponent of not leaving my kids a pile of trash to sift through. See my other comment on this matter for background.
They could just have it on a portable drive and look through it whenever they want. It's not like they have to catalogue every picture :)
Looking at my device storage, I have 91Gb online for 5 people. That’s everything we have ever done. Because we care enough to look after it and curate it.