if you had to actually put effort into getting all your extends. Score extends and the item extends like in PCB and IN, I mean. in those games, you can do nothing and still get all score extends (PoFV being the only exceptions). in IN, you can get all the extends without particularly difficult play (for example you don't need to PoC the big fairies in stage 4, expecially if you go for kaguya) and in PCB, it's kinda iffy. most people don't get 1400 items, and even 1200 seems to elude some. but the 1000 extend is still easily attainable and that's the 7th point item extend (plus the two extend in stage 3 and 5).
imagine if ZUN doubled or tripled the score requirements for EoSD or MoF extends. 450m for the last extend in MoF? suddenly people wouldn't get it as easily. as it stands, I have never seen a serious run that cleared and didn't get all of them.