Magic slippers? The only one wearing magic slippers is the strawman. I'm playing stamina-build vocations right now, with the archer being the closest analog to the gun wielder in more "reality-based" games. And as an archer, I can actually run real fast past some high-level foes in a forbidden dungeon, steal a high-level bow, and even use it as a low-level character, but it wipes out my low-level stamina in one or two shots. This is realistic, as I've tried to draw back more powerful hunting bows IRL and my puny worm arms couldn't do it. Now if I were to "level up" by going to the gym, then perhaps. Same goes with a .44 Magnum - my old man wrists would probably fracture shooting such a weapon over and over, so I choose a lower caliber fit for my IRL "level".
"Any sufficiently advanced technology is indistinguishable from magic." I don't know about Starfield, but a lot of futuristic RPGs swap and replace "tech level" in for magic, with suit power being the equivalent to magicka, and various energy weapons being the equivalent to spells. Obviously RDR2 is an exception, though one might argue that dead eye is a high-level time-slowing spell, and snake oil is a magic potion with insta-heal properties
Again, I think it depends on the weapon. A lot of common folk around here own .22 pistols and rifles for self-defense, and there are plenty of stories of people surviving single shots to the head with a .22 caliber bullet, especially grazing shots. Don't get me wrong, I am the
last person to defend bullet sponge gameplay (unless done in a believable way, like the dudes in Uncharted who wear prototype Iron Man suits). But I also don't think it's realist, or fun, to be able to one-shot everyone in the game, especially those wearing helmets (or androids or giant bug monsters), with the equivalent of a cheap .22 pistol.
All that said, if you as a player have the skill to shoot someone in the eye with a .22 pistol in real time (no time-slowing cheats which should be unlocked at higher levels, not level 1), then yes, that for the sake of immersion alone, should bring down whoever you are shooting, assuming your target is a regular human and not genetically engineered super-soldier or T-800 terminator.
And what I've seen in your and other Starfield videos, with civilians taking multiple shots and just getting up as if they were stung by a bee, well that's full rubbish nonsense, LOL, so ultimately I
am on your side.