Personally I don't do it nowadays, so i agree about not needing more than those for each girl's route when you're in a later stages of the game like WTHI. But i used to do it whenever i started playing new game and going through stuff, so i can understand the logic of these ppl cuz you start fresh and have no idea if any decision is relevant or not in future (in some games even some seemingly meaningless decision can bork your entire route/playthrough much later). And the amount of saves stack through time. Also i play blind and don't use walkthroughs and this kinda stuff unless i have to. So yeah, i kinda get how some ppl complain about 99 pages in a large games or ones that have zillion decisions that seem "why do you even put that decision, it's completely meaningless". And, there are those ppl who use saving feature as kind of "gallery" when there is none, they save in favorite sex scene and start whenever feel like replaying it.