And the crippling sin that ruins this? Some of these items require late game equipment to get... yes, that happens in all Metroidvanias; The problem is that said items are, well, regular... like an ordinary missile tank. You shouldn't have to grab the last item in the game to go back to the middle of the game to get a regular missile you'll never use since the game is over. Furthermore, Metroid 2/Returns... does not have a connected world design. Metroid 2/Returns has a Stage based design... as such, you should never need something from a later stage to get things in an earlier one. Teleporting helps this, but it's a flaw in the system.
100%ing always requires backtracking a Metroidvania, it is one of the defining attributes, even for "basic" items or collectibles that are useless. ---
Official Teetotaller of PotD Dovie'andi se tovya sagain!