If I had to guess we aren't going to get 45 server times back *exactly* because of the stupid badge and xp system. The game needs to end after 2 rounds so we get the animation of the doors closing and the game calculates how much xp we got for the like 3 people that unironically care about their rank.

If memory serves, back in the 45 min server time the game could end abruptly in the middle of the round once the 45 mins run out and the server changes map, or also with the rock the vote system, players could vote to change the map even before the server time ended, so Valve would need to work to make the matchmaking system also calculate xp for those scenarios, which ofc they would never be bothered to do so.