>>724958810
You need a guide to do 100% (which isn't even the true 100%) because the game doesn't even tell you anything about zone completion though? Even though most metroidvania released in the last decade do at the very least give you that.
And, funnily enough, the game does an effort to give you the location of the flea (even though you don't even need all of them to reach act3), so why couldn't they do the same for other similar things?
Besides, 2 weeks in, as many people who cleared act 3 did the SECRET cursed ending... If that's not a clear sign most people used a guide...