I don't think this old school mindset holds water anymore. Introducing distractions with ties to previous shortcomings makes a ton of sense. Training the players to focus on what they can control regardless of what's going on outside the objective is exactly what we needed more of mentally last year, but we aren't in a place where everyone needs to be torn down and rebuilt. I'm a fan of these S&C changes, especially after the gains we saw last year.
They play games and practice with noise all the time. They play on a national stage regularly with lights and distraction. Doesn't seem to have the impact IMO.
As for the drill sergeant mentality, it only makes sense to the extent you can tie it to the objective. BVG did plenty of yelling and being a dick, but that didn't make us competent. Just lighting up a person for messing up and setting a hardcore challenge does nothing to spur growth and development in a player or professional if they don't give a shit about the objective. So show them the turnover chain, the smoke and all the BS at Miami that got them all so turned around. Drill into them that they control the outcome and have support to stay locked into the objective. Then put them in positions where they can succeed incrementally. That's how you make correct behaviors second nature.
There's being a dick and applying pressure. Not sure you understand RL. I've experienced and applied this type of pressure and you can find out a lot of about a person's ability and fortitude. I know this does correct behaviors. I know.
As for the fight or flight thing, that's a technical pet peeve of mine and no knock on you, but it doesn't make sense in this context unless you want everyone to run.