[kadoban]

Fischer removes a lot of thought for the player around "oh I know what I want to play, but I better think more or the time is wasted" kind of thinking that some other systems have. It does add "oh I can play this forcing move for free extra time", but I never do those (it feels vaguely scummy) so effectively I don't need to think about it.

It's also easier to specify eg: you have 5 minutes, add 10 seconds/move. That's all of it. The specification for byoyomi or canadian are pretty detailed if you don't just assume someone knows how it works.