A lot of people posting here have been suggesting that having any sort of promod would "kill the game," presumably because they believe it would produce too great a divide between pub play and competitive play. I know my opinion isn't particularly important, but I disagree with this: using a mod (such as tftrue) to remove the sticky ramp-up would not be significantly different from what we as a community have already done to the game. For instance:
1) Class limits - we're so used to this that it's easy to forget how shocking this is to a pub player unfamiliar with 6v6. 6v6 immediately strikes a pub player as strangely empty, as they're used to 12v12. Add on top of that telling them that they can no longer main their favorite class (if it's spy, pyro, sniper, etc.) and you've already setup a huge divide.
2) Whitelists - now you've not only told someone they can't play their favorite class, but they can't use their favorite items. A large number of people would be very upset that they can no longer use gunslinger or loch-n-load. Whitelists aren't mods, but they are modifications required on the part of server owners that are rarely seen on pub servers.
3) Custom maps - now snakewater, process, etc. have been accepted as official maps, but for a long time they were seen almost exclusively in competitive tf2. And now we have even newer maps, like metaworks and sunshine. New players will be confused at the very least, and a good deal of them will be upset - they'll wonder why we can't we play dustbowl or 2fort like they usually spend most of their game time on. Further, this is also a 3rd party file that both server owners and players are responsible for downloading and installing, like a mod would be.
4) Server variables - remember, to even get on the valve quickplay list your server has to have random crits turned on. We turn off random crits, damage spread, weapon spread, and a bunch of other modifications. I fail to see how just because valve happened to provide a built-in way to modify the rules of the game, this is essentially any different from changing a server variable using a mod like tftrue.
Let's be honest with ourselves - what will be more off-putting to a pub player trying out 6v6 for the first time: being told they have to play on a strange map with a class they don't usually play and weapons they don't like, or simply reverting the sticky damage back to what the vast majority of players, both pub and competitive, are used to already?