We can agree to disagree.
I have my own view on current state of men's tennis, and you have your own. Men's tennis in general is just on the decline. And I'm not talking about Slams, Big-3 dominance or nextgen. It's about the popularity among kids and teenagers. Nowadays tennis is the 3rd choice at best for a talented boy. And it's going to be even worse in years to come.
The average top 100 player today is in better shape and has a stronger ground game, which is mostly what the game is, than at any time in the past. There are more people playing tennis all across the world now than at any time in the past as well.
Tennis is second or third choice in more countries than ever. It was never first choice virtually in any large country. France and Spain have very broad and deep tennis cultures for example and much more youth training than they ever did in the past.
People often see things through rose colored glasses depending on when they started watching and whom they liked the most.
I started with Borg, McEnroe, Connors and Vilas and the general trend has been upward in tennis. Some things get lost but the overall level tends to rise across time.