I mean, both LEV and SEN banned Lotus on the 2nd veto. Lotus is probably a good map for LOUD but not good enough for them to pick.
And in first veto, there is Icebox (LOUD is very GOOD – 80%WR, one of the loses was against FNATIC in that finals and it was 11×3 for them so they threw)
LOUD is really really good in a LOT of maps, picks and bans it is not what is going to make u win against them. + Ascent is a playable map for most of the teams, so it is better to try getting a win there than in a harder map where loud is good and ur team not really (icebox, sunset)