TheTruth
G.O.A.T.
I view it from a different lens. 2+ hrs on a tennis court is long enough to show who is better that day. If you are a world class tennis player, and you cannot bring your best stuff within the 1st 2hrs of the match, I think you deserve to lose.
I think for grand slams, the 128-person draw allows a lot of players to get in that ordinarily wouldn't make say, a Master's 64-person draw. Many times, with qualifiers, lucky losers, guys coming off of challengers, wild cards, etc. the top guys haven't seen many of these people and need time to adjust. These players outside the top 100 can then gain an advantage. They can view tapes, they already know their reputations, tendencies, etc.
There's been too many times I have heard the pros say they don't know anything about the guy/girl. It takes a set or two to understand their tendencies and adjust accordingly.
I think best of five is better for the slams.