the shit is 100% conflip since it entirely depends on how much the enemy's map pool matches with yours. FNC 3-0'd EG in the Masters final on their playing field and despite the fact EG weren't really comfortable with the map selection at the time at all, each map still looked close. The only certain advantage you gain from this UB advantage is that you get to chill and anti strat teams that are still playing in lowers until one of them reach the final. If EG won the UB final, I can swear to you up and down that they would've won the series that'll probably be a 3-0 bc of how much different both team's map pools are.
EG bans Lotus, Bind, then pick Fracture. FNC pick Split, EG picks Pearl (FNC's perma ban), FNC pick Haven, decider is Ascent. Strong possibility for a 3-0 here since EG prepped for Split in their finals match vs FNC and are riding off the momentum of their Fracture win, and at WORST it'll be a 3-2 in which the last map is 90% EG's favor since they're comfortable on it whereas FNC religiously avoids it.
Showcasing how strong this kinda advantage is, EG also showed how useless it is vs PRX in the Champs final bc at that point both of the team's map pools were way too similar to even care about. 3/4 maps in that series were wins by teams who didn't even pick the map. Winning the UB should guarantee you an ensured and relevant advantage, what we have now is either too strong or too weak with no in between.