Why does vanguard do format change?

Ever since coming back to this game on the standard format (I played premium some 8 or so years ago), i just accepted that after not playing this game for so long, there are bound to be significant changes to gameplay and never stopped to question why there have been 2 remakes since premium. Is there a reason they revamped the gameplay this wildly? Why couldnt they just stick with the first format change (V format i think it was called)? Will there be format changes that significant in the future?