It's true that a 'very open' job design could lead to inevitable exclusion of some jobs in favor of others. This is one extreme... The '2min meta' currently stays in the polar opposite of that.

Couldn't be somewhere not in either end? Even back in Stormblood the game still favored burst windows, but there we had a more diverse array that made jobs feel more unique while groups requiring the awareness of the party composition to properly seize different moments (eg Trick Attack 1min windows).