I used to ride bmx brakeless. I took them off after dislocating a bone and tearing some ligaments because I tried adjusting my manual by pressing my brakes but I pressed a little too hard once and flipped over the bars VERY hard.
I also had lots of problems with adjusting them and they got in the way more than they helped. When they went out of adjustment (which was a lot because you were really using that bike), they would dangerously slow you down unpredictably while you were carving, doing a jump, or rolling up to a street trick. It was actually dangerous to have brakes in a lot of circumstances. They were also very non intuitive.
It was really hard for me to ride with them basically and they made me feel unsafe.
Back in those days, 990 brakes were (and probably still are) designed to lock your tire in place and hold all of your body weight while you did some kind of fancy thing. You barely touch those things and you were already skidding.
Most front forks did not have mounts, so you were stuck with just a rear. It was also a huge PITA to have a front brake.
You cooould adjust them to be a little lighter but then they didn't stop you well because they were in the rear.
Basically, it was no different from, and in many ways inferior to the old foot in the back tire trick.
Unlike road bikes, most BMX bikes back then had wishbone seatstays that would catch your shoe and insta-lock your rear tire just like a 990 would.
Because it got stuck between the tire and the wishbone, you actually didn't wear out your shoe very much because the tire was not rubbing against it, it was locked in place.
If you wanted too, you could also modulate your speed by moving your heel in and out.
It was waaaay more intuitive than a brake, and you felt like you were slowing and moving much more naturally (thus less random injury).
Because of how small the tires were, you could practically stand on them if you positioned your foot right and it would set you up for a bail much better than if you were to try and jump backwards off the pedals.
It wasn't much of a trend back then, like 70% of pros still rode with a brake, and if they were brakeless they were for sure street riders.
When you ride a sick solid well built bike when you're street riding, it stops feeling like a bicycle and feels more like an absolute unit that you can just mess around on.
Just imagine something that has absolutely no loose parts and weird creaks, that you could go as fast as possible with and hit like a 10 ft drop and it would feel exactly the same after you landed.
So it was basically just this "thing" that had a chain that could make you go faster.
Simple, solid, intuitive, fun.
The bike was basically an extension of you.
Nowadays it's a huge mega trend and you see kids powersliding and what not. Cool!
Anyways, the point of this post is that not all people ride brakeless because of hubris.