[bluecalm]

Kasparov, to surprise of no one, comes up with a self-serving metric. If anything it should be opposite. If you're so far ahead it usually means your opposition is quite weak. Being at the top for 10 years today is way more difficult than it was in Kasparov 's time for example and that was way more difficult than in Lasker's time. Especially taking into consideration that he enjoyed an enormous preparation advantage thanks to his team while today any idiot with a high end GPU or a CPU can see all the best opening moves in seconds.

There is still advantage in preparing the information in a way it's useful/easier to remember and that's what the teams of top GMs do but there are no purely chess secrets anymore. It's just much harder to be ahead of the field today.