I only have to add, for main purpose of your actual question; it would obviously let you ratio your deck for a burst combo nearly every time situation. but with less than 30 you would deck out a lot. many of my decks would run way better at 25 as with my deck presently if I don't win by turn 7 I probably loose anyways. and its usually cause I'm drawing 5 wrong cards too early game.
now the reason I'm actually on this topic; I would love if minimum deck size was removed, only cause I constantly run into the situation where I'm building a deck, need a card try to go to bazaar to get it, only to be reminded I have to throw in 8ish cards real fast so it will let me, then buy the card I need, go back to manage deck, and have to go through and remove those filler cards before I continue focus on building.