I feel like that’s how’s it’s supposed to be at the moment right? You have prefer or require, and with prefer it sounds like it will choose your preference like Chinese rules or Fischer but it might still give you other settings.
I think though it’s better to have the automatch times standardised. It’s already confusing enough as is to either know or explain to someone what time settings they might get in automatch cf
Nevermind if you can randomly get 11mins+4x7s because it’s within some tolerance of something you want. It’s just a bit chaotic to keep adjusting to all the different time settings (for me say). It’s nice, I think, to internally have a feeling for how fast you need to play with a certain byo-yomi or a certain increment, and it gets harder to do that when the settings could be different every game.