Why exactly do you want a lower level of control? You want the complete opposite; have as many problems solved for you already with battle-tested ways to break

Why exactly do you want a lower level of control? You want the complete opposite; have as many problems solved for you already with battle-tested ways to break out of the happy path when you need to. Every sufficiently large Flask app becomes a half-assed reinvention of half of Django, except without the hundreds of thousands of eyeballs and man-centuries of bug fixing.