The bugs do look silly.
"From Brave's PoV though I think these are brave and practical decisions as it helps them to reach the MVP phase sooner."
-I believe the above statement describe the situation well.

Brendan Eich designed JavaScript. So he may favor anything that involve JS. I'm not a programmer. I haven't entered any important passwords on Brave. I'm still waiting and may not migrate for another ~6 months.

I haven't looked at the code. But the front end works well for Android. The UX is good. Nothing mind blowing. But I'm very satisfied with the browser. BAT seems to be interested in securing partnerships and getting things running first and I think that's a good pick. They take their time to release features for the less fault tolerant mobile crowd which is a wise move.

As an investor I'm very positive and team has a proven track record. Their main point is BAT and Brave does take a second row seat. But they'll fix things up well after they get their Ad system fully functional.