Advancement in the game is all well and good but it’s the same for all teams surely?
In any sport, the top level should see a tiny margin between competitors who all have access to the same resources and employ the best people. Records should slowly creep upwards as incremental improvements are made over time to the game as a whole.
I doubt very much that there is much difference in training facilities, diet, conditioning, data analytics, etc. between the PL clubs who have been in the league a long time. There certainly won’t be between United and Liverpool for example.
You can either blindly accept the beauty of sport and truly believe things like team sky cycling were just really clever, or all Jamaican sprinters of the same generation were super fast (when not many had been before), or truly believe that after years of the PL’s best sides struggling to break the 90 points totals that two sides come along at exactly the same time and break it 5 seasons in a row between them.
Some things can be explained by good tactics, good recruitment etc. but we’ve had all these things before. I just don’t buy that somehow Guardiola and Klopp are just so brilliant that they’ve unlocked the secret to consistency that somehow eluded every other manager in the history of the game.