It's all cool that you are against a stamina system, but I'd like to know why.
Because it's either going to break melee in general (for instance, not being able to swing enough times to deal with a few people), going to introduce erm unintended consequences depending on what all falls within the stamina system, for instance running, etc), while not fixing any real or percieved problems.
For instance, what you mostly classify as spam are, in a single fight, 2-3 swings, since that's enough to kill someone who doesn't block. So, in order to fix that, you'd have to do, what, make someone swing and take a breather then? Doesn't make sense, and would really break combat.
Feinting? Ok, if you made feinting take stamina, you do solve the annoying "lolfeintspam" (well, personally I'm not bothered by it, since I like long weapons so people don't get to do that on me, but it is generally annoying and a pain to watch), but it doesn't solve the funny feinting speed of long and heavy weapons (which, unlike attacking which is generally fine, seems just physically impossible).
I just don't see the :point:. The only people who get purely spammed are turtling shielders, people who don't counterattack, peasants and wooden structures. And I see potential bad side-effects.
If you wanted to discuss specific balance issues with xyz stat/weapon/mechanic, it'd make more sense then proposing a stamina system to stop "spam".
Also, if you want to propose a mechanic to combat something which is very subjective (eg, "spam"), you have to precisely describe what exactly is spam and how do you propose it should work.
Playing right now with 100 skill in one handed weapons, and shield level 4, I rarely get a chance to swing back if I'm forced to block a 2H barrage. Do I need 200 skill?
Tbh, it's much easier to "screw up" with a shield+1h vs a 2h/polearmer then it is to screw up with a 2h/polearm, in my experience. To fight with a 1h/shield takes a different set of skills then to fight with a 2h weapon.
That said, I find it :easier: to do reasonably well with a 2h/polearm in melee at lower levels. On the other hand I only really liked shield+1h when I reached levels 26-30 when I played it, before that it was quite a pain. Then scoring kills was fairly easy (of course str build and heirloomed weapon really helped to cover the typical 1h damage deficiency) in the thick of melee. On the other hand, with a polearm/2h I really prefer hanging around in the sidelines instead of leading the charge.