bracket reset is even harder for the lower bracket team to win than bo5 map adv tho
I feel like these games always feel pretty lopsided because they ARE lopsided-- the quality of the teams isn't that close, so it feels like it ends before it really gets going. If you had equally matched teams, the chances of winning 3 maps before the other team wins two wouldn't be THAT unlikely, but the reason you never see it is because the UB team is usually significantly better (in many of the recent RGL seasons).
Pick/ban advantage might make better viewing, but I'd wager a lot of those times it will just end up 3-0 or 3-1 and not be very close anyway. You should be rewarded with a significant advantage for not losing a WHOLE SERIES in playoffs. Pick/ban adv is not equivalent to losing a whole bo3 before, so that is generally considered too unfair for the UB team (u lose one series and u lose playoffs, other team lost one series but they are still alive)