We will have to agree to disagree on this. The big 3 had to win 7 Bo5 matches to win all of their slams and routinely had to beat 2 of the other players between Nadal, Djokovic, Federer and Murray and the big 3 specifically had to beat at least 1 of the other big three for their titles. That was on top of having to endure 7 Bo5s as well.Almost always had to play vs 2 of Rosewall/Gonzales/Hoad to win them. No free rides here
Plus only 3 chances a year to win slams instead of 4
Also yes there was only 3 pro slams, but 2 of those 3 were on grass and that gave a great grass player like Laver a distinct advantage for racking up slams. Imagine how many slams Rafa would have with 2 clay slams, or Djokovic and Federer would have with multiple grass slams.