Blackjack betting unit sizing: what's actually optimal

Been thinking a lot about what size unit to bet in blackjack. Most advice lands around 1% of your bankroll per hand, but the “right” answer seems to depend on how much risk you want and what you’re optimizing for. Some folks treat the bankroll like it's sacred and have a set cap, others treat it more like optionality. My angle is more towards flexibility than trying to grow a bankroll as fast as possible, so nuking it on one heater isn’t appealing.

Is it actually better to scale up units aggressively after a winning streak, or do you guys stick with a strict percentage no matter what? Sometimes I want to push when I’m up, but hate the idea of giving it all back fast. Anyone got real-life experience on what works better long term, especially if you don’t reload the roll all that often?