I'm curious what you notice is missing in terms of feature parity. I'm mostly a back-end developer (not diving into devtools very often) and switched a year ago. I'm much happier and haven't looked back.
* blank pages when trying to load an imgur gallery on v68 (esr).
* image uploading not working right on instagram and various other sites, either producing blank images or ones with weird lines.
* several teleconferencing / video meeting websites just don't work properly, whether it's not detecting hardware properly, etc
I have to keep chromium installed so I can use these sites properly.
https://bugzilla.mozilla.org/enter_bug.cgi?product=Web%20Com... if you're on desktop.