Didn't know such a hack existed. Interesting. Can the doors be removed entirely?
Yes, a hack called Super Metroid: Stardust has removed some doors and simply left them as room transitions. Redesign *shudders* uses morph tunnels as some door transitions. The same could be applied anywhere.
That's an interesting point of view. My reasoning is simple. There are many places you can not go until you obtain certain items.
This is a plot device that almost every game in existence uses.
Generally speaking you need to obtain some items in a certain order, example, the ball is the first item you must get followed by the bomb, generally. That list goes on. The goal of this mod it to remove the limitations of the order of acquisition of as many items as possible.
An interesting idea, to be sure. It would open up the game a little bit more than it already is. Can give new approaches to some areas.
Additionally, removing limitations to what areas one can travel to in any given order.
By having some items in the areas they are in, order will be kind of predetermined anyway. Unless you wish to challenge yourself and try to get to areas without said items. That has given many players reason to revisit the game to try new possibilities. Reverse-Boss Order became a thing. Bingo became a thing. Just to name a couple.
As an aside, have you tried out Dessyreqt's Super Metroid Randomizer
? It changes item placement around which kind of does what you're doing but just differently. Depending on the difficulty you select, your starting item could be Speed Booster. For an easier time, it could also be Screw Attack. Morph Ball can show up in Charge Beam's room in Brinstar.