You really can't claim that a flame is touchier than a salt bath because it's hotter. There's a huge difference in heat transfer. The flame is acting in air (a lousy thermal transfer media) while the salt bath is acting by conduction. It's like the difference between putting your hand in a 350* oven (not even uncomfortable at first) versus reaching in and grabbing the rack (almost instantly damaging).
GsT
The flame has intimate contact.
Not radiation heat transfer (IR).
It is way hotter than needed.
You do not want dead soft case necks.
They produce very low neck tension till work hardened again.
You do not want fully hard necks either.
They split all to easily.
Not that much of a deal on bulk ammunition for casual blasting but a real penalty on formed, neck turned, and altered cases.
BR guys often have relatively few cases for competition.
There is even tooling available to tighten loose primer pockets to save those well prepared cases for another go round.
I only had about 20 or 30 cases for by BR style live varmint rifle for longer range shots.
It was accurate enough that it produced one shot kills on groundhogs at somewhat 'extended' range.
When you shoot over animals they start to learn to keep you even further away.
Crows are even worse then groundhogs.
Probbaly their better eyes.