Not the main point of the thread as tri said the pool has already been decided, but I'll say this anyways. Viaduct is easily the most interesting/exciting map to spectate because all the fast paced action and fights, and even to play and get rolled by a better team is usually still fun because there are no stalemates and it's so inherently back and forth (unless you get forward held for 3 minutes which is extremely rare obviously). Nobody I've spoken to in invite (besides b4nny and lucrative who have rather extreme opinions on completely changing the map pool) seriously thinks via should be removed, because it's such a perfectly balanced and fun map to play. Maybe in lower divisions where people aren't as coordinated and can't as easily counter a sniper by bombing and proper pressure, I can see people disliking it, but we should balance around the top level not some open team that never learned how to play the map properly or gets tilted cause it's different/they're not used to it.
I think it's the best map in the rotation because it allows every class to shine and show off their mechanical abilities/gamesense (medics surfing/arrows/movement/positioning, roamers going behind/sacking, pockets the same as well as doing good uber trades, scouts/demo clearly being super strong on the map).
Yes it is the only koth map but the fact that it is so good should be plenty enough to make that not matter. I see no reason why the pool must be entirely 5cp or koth or whatever other gamemode, and if anything it would be good to see more koth in the rotation. They add a completely new and unique element to the game and makes it so the team that is best at process/pug maps must also be coordinated and have to adapt to a different environment which is good imo and adds depth.
I do see the problem with the current ban system however, because people generally don't want to be upset on viaduct and unless you're really confident in your ability to play it well it's probably better to avoid the risk of choking and losing. I agree with the above posts about how moving back to a weekly map based system would help on this front and force people to learn to play via/propaganda as well as other less commonly played maps (and this preventing space cadet from having to play one in every three matches on process lol)
It's unfair to draw a comparison to gpit as that map was nearly universally disliked, or at least is now aside from a handful of people who want it back. Via seems to be the exact opposite, with only a select few people legitimately thinking it should be gone. The reason it isn't played is not that it's bad by any means, it's just different and people don't want to get upset. It doesn't help that it isn't played in pugchamp for whatever reason (iirc it was a config issue but I feel like that's not unfixable, maybe I'm wrong tho)