Well - no.
When you play a 6 classic escalating game and are a noob, you may learn something.
When you play one of the game I quoted, the only thing you can learn is that having a team of quad ready to play freestyle will you grant automatic win against unorganized team - maybe a good thing to learn but won't help that much.
Playing game (2) and (3) you'll lose or win because of your mistake, playing the kind of game I quote, your mistake was to join that game, with close to no strategy when they are objective freestyle ones.
Furthermore, playing games type (3) it is indeed possible that the players you are facing are willing to give advice. I've experienced it, giving and receiving advice. Playing a game against farmer, I highly doubt they are willing to teach.
where's the evidence of a greater supply of (2) games--after the anti-farm policy?
Well, if there is people willing to play, they'll join games. If games (1) disappear, people that would have join games (1) will join game (2) or (3). There is no lack of games to be joined. There is lack of people joining them only.
Where you may be right, is that the case I quoted are a kind of extrem - manual deployement, quad games, freestyle, objective map. And that maybe "anti-farm crowd" did fight against less unusual kind of setting, and against map that actually "noob" would like to play and could learn. I do not know about that, and am unable to set the precise limit of what should be, should have been, forbidden.