Just to crash in about the original post....
This stuff doesn't matter. If the surfaces now were as they were then, we would be talking about different players anyway, because Rafa and Novak wouldn't be doing as well.
In other words, this era against other eras is a dumb argument because the best players on a given surface rise to the top and the surfaces Becker played on barely get an airing now. If the courts had been slower in Becker's time, it's not a question of whether Becker would have adapted, because there's no guarantee he would have been part of the conversation when it comes to top players.
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