Well, they shouldn't. So, I guess we should remove concs, nades, rockets, jumppads, sniper boosting, pyro jumping etc. etc. as well, since all those can be used to acheive much the same effect.
Well, I'm serious about the jumppads, at least 
The issue in my opinion is not so much it's possible, it's that there's no downside to it. No risk to the reward.