BACK TO THE ORIGINAL TOPIC
If you agree with what I said in the original post, please explain why and how you think it could be improved.
If you disagree, please explain why you think it works vs other's suggestions.
The slow base stamina regeneration and fast exhaustion is IMHO mostly an issue in the early and early-mid game. Running around and having to pause every few seconds to regain stamina does not feel well balanced, I'd expect that after about 30+ seconds on an untrained (= Level 1) human.
Once you get to bicycles, stamina becomes pretty much obsolete when it's about moving around and is important for working (mining, harvesting, chopping trees, ...) and melee fighting. The perks do certainly help with that, but to really have fun in close combat it currently takes too long to get the necessary perks (because level gates. Level gates are bad, mmkay?) as you require the generic stamina perk, some weapon-specific perks as well as armor perks.
I'd say the base rate for stamina regeneration should be raised a bit to make early game less slow, especially because that is exactly the time where you spend a lot of time running around and fighting close combat. Or, as it currently is, walking around and waiting for stamina to regenerate

Also, the stamina cost should be reduced for certain actions (e.g. running and jumping, oh my that expensive jumping ...).
Pretty much a balancing issue, I'd say. That, and perks shouldn't be behind level gates, then it would be easier to form a specialized char who is good in close-combat (but pretty much nothing else) at Level 20 or so, compared to now where you have to reach Level 60 or 80 to get to the useful perk levels.