Brave and Vivaldi will continue to support it for some time. Brave also does not really depend on MV2 as they have their own adblocker (which is about as effective as uBO, I believe).
Original comment: Brave's built in blocker is OK for what it does but I believe that it only replaces a subset of all uBO's features. For example I don't think that Brave's built in blocker has an element picker that lets you create cosmetic filters on the fly. I use that feature all the time in uBO.
You're right, I just found the option on desktop in the right-click context menu. According to some posts I've just found in the community forums, the feature was launched years ago but for some reason I had never noticed it even though Brave used to be my default browser until recently
