Sampras was always 10 slams potential, he has 7 at wimbledon alone, he had 13 slams on his 30th birthday which is in the same ballpark as Nadal's 14 and Federer's 16 or Djokovic's 12 for that matter. Agassi was also a 10 slams potential player. Mcenroe, Lendl, Connors all were also 10 slams potential if they played in today's era, their eras did not allow them great level of play into their 30s. Borg actually won 10+ slams by age 25. For the matter of fact even Becker had potential to win more slams than his 6, he too could be said to be a 10 slams potential player. History has always had players who could win 10+ slams in the present era.
I'm not sure what you're saying. That past greats could have won 10+ in the current era? As in with modern technology and sports medicine they could have played longer and done so? But would they also have modern competition or the generally lower level of competition across the board that all sports had in the past? Comparing the tennis landscape from the 70s and 80s to now is difficult at best, and impossible if we take only the benefits of the modern era for past greats but not the depth of competition that the modern game has.
Either way, that wasn't exactly the statement made earlier to which I was responding. My point is that having the likes of the Big 3 is a complete anomaly and that there was never a time prior to that when we constantly had big matches of 10+ slam potential players, unless you have a more generous meaning of what 10+ slam potential is than I am thinking.
To take one of your examples from the 90s: I love Agassi and sure, he
could have won 10 slams. So could Becker. I completely agree they
could have, but 6 (Becker) is pretty far from 10. If that's what you mean by 10+ slam potential, then OK. The 90s had maybe three guys overlapping for large portions of their career in Agassi, Becker and Sampras. But even with that mindset, it's not even in the realm of the Big 3 as far as tennis dominance. Those three played each other 17 times in the majors. The Big 3 played 49 times and most of the time in the QF or later. It's crazy how dominant they were.
I don't see much difference between the current crop as far as highly skilled, competitive matches, and past eras. In a decade, surely we will look back (and can probably say so now) that Sinner and Alcaraz have 10+ slam potential. Depending on how far we want to stretch it, Medvedev is 10+ slam potential without the Big 3. So was Roddick.
I agree with you tennis needs good players playing big matches. No doubt. Maybe we're saying the same thing and I'm just not understanding you. My point is the Big 3 isn't the norm, and if 10+ slam potential means a player
could win 10 if the all the cards fall in their favor, then I think we'll be fine, just as we were before the tennis gods descended upon us.