There's research done on our nervous systems and stress responses, and how they evolved in an environment that we're so estranged from today that they're basically irrelevant and maladaptive, but they haven't caught up to modern lifestyles.

Basically we have the same stress/anxiety/fear responses that have been hardwired since we were hunter gatherers. Back then, threats were acute and immediate. You see a big cat with sharp teeth, you have a sympathetic nervous response where you feel an adrenaline kick, you run away or you face it with a spear. You either get away from or eliminate the threat, or you die. Either way, it's over in like twenty minutes tops, and then the parasympathetic response kicks in. It purges all the stress hormones from your blood, replaces them with endorphins, and within ten minutes all your body's systems equalize and reset to their calmer baselines. Respiratory rate, heartbeat, digestion and metabolism, etc.

Nowadays, the perceived threats we face each day aren't like that. Deadlines, performance reports, layoffs, getting yelled at by your boss; being left by your partner for someone else; climate change, cost of living crisis, nuclear annihilation, random mass shooters, the list goes on. All these lingering threats that never quite go away and are always just hovering over us. Not quite enough to trigger a full fight-or-flight response. Just enough to let out a trickle of constant cortisol. And never really being resolved so that your parasympathetic response kicks in and replaces all those stress hormones with feel-good hormones.

A lot of modern self-care techniques are basically "body hacks" designed to use this notion. Grounding techniques to concentrate on something calm to move focus away from the stressors and activate the calming response. Focused breathing to tell your body it's safe and slow your heart rate. Watch a horror movie to activate a full adrenaline response so that your body can recalibrate when it passes. Go for a run or an intense workout to release endorphins and flush out all that cortisol.

It all centers on "how do we shift away from the body's stress response and activate the calming response?" And it's only necessary because of how radically different the modern context is from the one where those systems developed originally.

True. But most of the time people feel pretty safe driving, safe enough to fall asleep while hurtling down the highway at 110kmph (70mph)