Folks who advocate tuck and roll have no concept of what that means to many of us: absolutely nothing. I'm not a gymnast. I couldn't tuck and roll from a standing start to save my life. From a 20+ MPH moving bike while still clipped in is pure fantasy.

How one is supposed to do that hanging off the side of bike while still moving forward with the bike coming down of top of you is totally beyond me. And by the way, in all the TdF crashes I have ever seen, I have not ever witnessed any tucking and rolling, just piling up.