It sounds like you're just talking about something different when you talk about the "highest level of play" than I am. When I talk about the highest level of play I'm talking about the very best players and their level of play, not the average level of play.
I agree that the average level of play today (if we're talking about, say, the biggest tournaments in the world) is higher today than it's ever been.
But pool is not a team sport, and the highest level of play in my sense (not the average level of play, but the level of play by the very best players) is determined by how well the very best individual players play. If the best individual players are not playing today, then the highest level of pool is not being played today.
I see what you're saying, but I don't think that's a useful way to look at ANY activity or sport.
Let's say that Isaac Newton was the greatest physicist of all time. Does this mean that the study of Physics was in a "higher" state in the 1650's than today? It may be possible that Bobby Jones was the most talented golfer of all time, does this mean that the state of Golf in the 1920's was higher than today?
Of course not. These are obviously absurd conclusions. You said it yourself, that we're talking about the
very best players (players is
plural). Not the most talented individual in the history of an activity. The single most talented individual could be born in any time period, could have been 200 years ago, this fact doesn't say one single thing about the state of the game, or the ability of the very best players (players, plural).
I'm not talking about the average level of play per se, if we are both talking about the level of play of the very best players (players plural), the the level of play today is higher. Take today's top 10 or 20 and compare them to the top 10 or 20 from the 80's. No contest IMO, in just breaking and jumping alone, huge, huge difference.
Although I think you're right in that we differ a little bit on what criterion to use. Which is cool.