You make over arching statements about basses and amps that are untrue, and seem to lack familiarity/understanding with basic concepts like gain staging.
There are passive basses that have extremely high outputs, and active basses that have moderate outputs. On top of that, there is no consideration for anything that may be between the bass and the amp.
No one complained about not having a master? Funny, those pots aint free. They wouldnt end up on amps if people didnt want them. See, here's the pulse. And this is your finger, far away from the pulse... Say, would you like a chocolate covered pretzel?