Back in the day you just had to go when the ball came to your area.
Then you had to be able to run all day and explosive power was less important
Then they started running a million interchanges and you had to go for 2 minutes and then sit for 2 minutes, and explosive-ness + recovery was king
Then they introduced interchange limits to deliberately slow the play (ostensibly to reduce impact injuries, or whatever), and being able to run all day without a break became more important again.
And in the future they will tweak more rules that change the balance again to something they hadn’t considered.