yes i agree, people are using what,seems,a,very variable defintion of "" MASTERED".
the 30to 40 years level that some are,claiming is clearly a made up number based on nothing at all.
karate is not that complicated a movement pattern that it can't be mastered in a few years, you don't get other sports claiming that the best gymnasts or the best tennis player need to have been practising for 40 years, its frankly ludicrous to claim such. Most of them have won their medal and been retired for a,decade or two. Any one want to claim that a 50 year old gymnast is better than a 20 year old gymnast, if so, show me one in an Olympic team
Again though, the professional sports person spends hundreds of hours a month in training.
The main reason for all the style vs style nonsense in this forum is this endless comparison between those training in a pro or semi pro capacity vs those training in a more casual manner.
Karate does not have any kind of professionalised training model that is geared towards fighting alone. Yes I'm sure there are a few kyokushin teachers out there who are the exception, but they probably took decades to get to that place where they could devote themselves. All the others who are that dedicated in my experience spend more time mastering the ephemera of technique rather than just fighting.
Ultimately the comparison between what pro sportsmen do and what your average martial artist does is one of apple's and oranges: both fruit but still different things.