Less "dire warnings on forums" and more "slow development pace for required pieces to make my workflow even possible again".

Here's an issue opened June 9 that hasn't been addressed by the Mozilla team and hasn't had any updates in a month: https://github.com/cmcaine/keyboard-api/issues/1

Here's the request for a better keyboard API (referenced in the above) that's been open for over 2 years with no end in sight: https://bugzilla.mozilla.org/show_bug.cgi?id=1215061

I'm sure the new FF is going to make some users happy, but as you said, having your workflow broken is quite painful, and the Mozilla team has known about this for years but still not made the upgrade path bearable.