I think that Infinite Corridor wasn't made so you could go through 100 floors in one sitting 
Well yeah, and that's fair during the normal course of the game. The problem is when literally the only thing left in the game is infinite corridor, and strengthened bosses were put in to account for gameplay outside of the corridor, with tangible rewards, for about two more loops of the thing. The only real content left is doing corridor bosses and out-of-corridor bosses; until you unlock the last item (after your third run of the whole corridor...) there isn't even a reason to chain floors and collect dust! Since if you wanna buy charms and statues, you can absolutely finish before 640f, and probably should whilst it's easy to overgrind.
At which point, taking hours to do any significant number of floors is just a pain (exploration is literally just an obstacle between your scaling refights- it's no longer benefitting clearing the game, which you've already done), and encourages putting the game down instead of actually playing the scaling content. Also, when "you have to fight something in the corridor", you're gonna use the M key, not random encounters while trying to explore. Especially because you'll probably want to find a good exp or money bonus effect, and/or a lucky/risky floor to do it on until you need to refresh your tp/mp. (The encounter reduction is very nice in those floors...)
Also also, you can't really stock dust ahead of time very well. The dust stock maxes at 25%, which is just a consolation prize if you die and lose your chain; it's nowhere near enough to want to use it to save up dust on purpose when you could be buying additional awakening items with dust->infinite gems instead. And as far as buying a bunch of tokugawa statues go, yes, it's intended to play about 50 floors of corridor in one sitting :V Furthermore, once you do get the final stuff, you seriously DO have to play nearly 100 floors at once to afford it. (If you make sure to clear lots of events, you can do it in more like 70, but... yeah, that takes several hours.)
The floors are understandable as-is for the first loop. But it just discourages playing after that. "Ok, my only content left is refights in the corridor, and... exploring it is a pain in the neck and takes forever!"