Have you sent feedback?
Having lived through Windows phone's saga, Windows 8, 8.1, 10 and the first set of outlook.com redesigns, I know one this - their feedback tool is a placebo button, a self therapy session to get stuff off one's chest.
Microsoft doesn't listen to feedback through their official channels. They might step back temporarily when there's overwhelming negative outcry from the news but they'll definitely attempt it again after a while.
Outlook web is a perfect example. It's 10x slower since the last redesign and their exclusive killer feature - SWEEP no longer works for me.