In regards to the sculpting brush changing on 2.8.. the build I downloaded from yesterday is still doing it somewhat, but not as frequently as it was before. One thing I’ve noticed is each group has a “hotkey” and it’s more likely to cycle through the options when you repeat the group key. So the Grab, for instance, is G and if you were to double tap G with it set to smooth, it would cycle to thumb. Every so often, in the brief playing around I just did, I would be on another tool (like snake hook or inflate) and press G. Most of the time, it was switching to grab but occasionally would switch to Thumb, but not nearly as frequently as the version I downloaded late last week.
One other quirk I noted, more on the shading side, was that it wasn’t letting me use the full HSV values. It would still keep it close, but wouldn’t let me use the “precise” values, either from slider or typing in the numeric values. Not quite as much of a deal breaker as the other annoyance, because it still kept the values close enough to work, just not what I’m used to expecting. (And I tested multiple color inputs, and every one has this, so it’s in the color selection itself… but figure that they’re working on things that crash right now so not too worried about it in grand scheme of things.)
Anyway, just thought I’d mention that since it was an issue last week with the sculpting.