I don't think you are either, but like the rest of that group , I expect that you'll keep using Chrome anyway. Because it's not like uBO will stop working, it'll just be a bit worse.
Even if the new version works now, Google are clearly going to tighten the vice over the next few years.
Edit: ah, looking at gorhill's comments it looks like this is not intended to be the MV3 version of uBO, but just one that has minimal permissions. Then I guess uBO will migrate in its own time.
Either way, very thankful to the developers and community for making our web browsing experience so much better.