I had an issue logging into my work account on the actual outlook application recently so I tried the web version in the interim and it really is a lot better. I am not saying it is a world-beater but when they couldn't figure out my issue, I just let the ticket close.
I've been using OWA for a while as my primary work email and it's nice. I probably pin too much shit, but it's overall a good app. And since MS is web tech obsessed, OWA will replace Outlook at some point in the future. Project Monarch / One Outlook is still super half baked and predictably an awful RAM hog compared to the native app, but the writing is on the wall.
Still waiting for them to replace the desktop app on macOS with an Electron app. The fact that no mobile/desktop client for Outlook doesn't have the like feature like Outlook Web is frustrating.