Bottas can only win if he holds everybody off. I don't think he's a great person at overtaking, and definitely not with others around him. So maybe it's the only tactic he can manage now. Get into pole, so do your best in qualifying, and then just keep it there and frustrate everyone else or get teammates to do that job.
I agree with what you said because in the last races it was like that, maybe even in the Max Verstappen race the only person who could be considered a threat because of being behind bottas from time to time.
but what I like about him in yesterday's race is that he always looks good and slick and is able to maintain the position he has and this bottas victory can also be called helping his team mate, Lewis Hamilton, to be able to catch Verstappen again in the hunt for the 2021 world title