I believe taste/preference as the differentiator is missing.

The "intense + focus" music on brain.fm puts me to sleep. My coding music is ASOT weekly series, it's usually couple of hours of house and trance music where I get immersed into coding zone and once finished i take a 10-15min break, repeat.

When I concentrate I don't hear anything that's when I know I'm in the zone. It's my preference and it's surely different from yours, hence why the differentiator is missing.

ASOT Episode 751: https://www.mixcloud.com/dancecontrol/armin-van-buuren-a-sta...