Which UI should MapleStory use? i did a poll

That functionality doesn't do anything for me, personally. Never will use it.

But, having 1 key to open my pertinent windows was massively useful since I could remove 3 other keys from my keyboard layout.

You say that until you get into the habit of doing it and realize how much faster it is. Regardless, it's about the trade offs. We lost this ability, here's what we got for that sacrifice.

Also i forgot to mention the equip upgrade UI is better imo compared to before. You can't see all of your options in a list nor can you skip past the scrolling animation (as far as i know), but you just have to click instead of drag and drop now and it looks simpler.