I dont quite know what the metagame is like in limited considering i dont do tournaments any more, so what i say may not be valid (though the meta is based on the parts i used when i played a lot so im more able to speak my mind then in standard).
However as a person who usually plays/played attack at tournaments (being one of the few people who did in toronto.. times have changed though), I am going to say my 2 cents anyways
Attack is the risky choice, it just is. And in a tournament setting it sometimes the worst because of it.
I have found that generally (not always, but usually), for attack to win it needs to win in the first few seconds of the game. You mess up that launch.. miss the first few passes at your opponent the chance of getting a KO starts to drop greatly, or maybe you happen to self KO and loose through that.. and man the pressure of being in a tournament, knowing that your winning is completely dependent on your skill on getting that flower pattern messes you up (even if just a little bit).
and R2F generally makes that margin for error become even larger due to sheer speed and aggressiveness.
Yes an R2F attack combo would probably KO whatever it wants to.. but its also the hardest to get that win for, so most people dont really do it.
anyways, banning R2F would mean people would just use RF which, imo is still quite capable of KOing whatever it wants as long as things are good, and is more controllable.
get rid of RF as well and then you got the plastic F tips and MF.
now i dont know anything about MF, but i have used all the other F tips.. Getting a successful flower pattern is hard, and with base F or HF wont hit hard enough usually to get the KO. and if you go with the larger Extreme or Giga flat you will have the power to KO, but the control to connect goes down..
Edit:
I should mention that I am not opposed or for the banning of R2F. i personally would rather use RF either way.
I'm just speaking my mind as a guy who likes attack types