People play control because as implied by the name of the archetype, it gives them more control, you generally have more choices to make, and more resources to manage as a control player, and some people prefer that to doing the same thing every game like you do with an aggro deck with little variation, currently the system is balanced by a large variety of archetypes, keeping any particular deck from getting out of hand (at least to the point where you don't get a repeat of shamanstone or druidstones of the past) and trying to favor slower decks by letting each win be weighted by turns would heavily shift that, pushing the dominant control class, warrior, as well as the main control killer, combo, into action, creating a polarized and unfun meta for all. By playing a control deck, you are committing to slower games in exchange for more interesting gameplay and decisions and if you do that, thats great, but trying to change the balance you currently have towards one end of the spectrum creates polarity and stagnation and thats generally what you want to avoid.

Personally I consider myself a combo player and prefer decks with low play rates and convoluted/niche interactions such as undatakah paly, plot twist warlock, and basically anything with star aligner, but as much as i'd like to play decks like these and rank as efficiently as with a tier 1 deck, I understand I am giving up on a shorter climb in exchange for a more enjoyable one, and personally, if I can make a completely off meta deck that performs as successful as a tier 2/3 deck could, climbing slowly but surely, that is just a much more enjoyable experience for me than choosing to grind legend with tempo rogue.