If you take a square and calculate Pi, it equals 4.
You might be asking, what the hell does this have to do with your question?
You see, it's one of those phrases table top gamers use to explain how RPGs are simulations. In D&D, you fight combat on a grid. When the world is a bunch of squares, you get glitches. Attacking diagonally is more effective than attacking straight. Fireballs aren't actually balls. When you think in three dimensions, it's possible to fire a fireball above your enemy off the plane of combat to reduce the size of your fireball instead of 8 squares across, you can reduce it to two so you don't hit allies.
a 2x2 square fireball.
Pi = 4
Strength, Stamina, Agility, it's all just a simulation. You cannot get high fidelity with a simulation. Ergo, there are going to be flaws. Attacking with zero stamina, for example.
IN D&D 3.0/3.5, at low levels, a +1 is a lot. So you round fractions to favor the player. I found ways to stack fractional damage in ways that turn a god-damn LOG into a slaughter machine. Yes. There is a way to make a log that can kill everyone in a hundred foot line ten feet wide, LIKE A MACHINE GUN.
Rapid fire a 100-pound log at people.
Or how a toad, if you put stilts on it, can now walk four times as fast.
If you give the toad 8-foot stilts, it still walks just as fast as 2-foot stilts, but NOW it gets a +1 to hit because it has the high ground advantage.
My toad with 8-foot stilts is still considered Tiny size class, so it can move through the square of medium-sized opponents with a tumble skill check.
If my toad on 8-foot stilts successfully TUMBLES through the square of the enemy to get on the other side, my TOAD on STILTS gives me FLANKING, allowing me to sneak attack. I assume the enemy is so boggled by an amphibian on 8-foot stilts TUMBLING between its feet, that the enemy's brain shuts down and he can no longer notice me.
If I use the familiar pocket spell, I can put my Toad on stilts in my pocket and whip this freak of physics out like a fookin' pokemon.
STILTOAD, I choose you!
Of course, I could get a custom saddle and put my toad on my head, so my toad could use the Riding Skill on me, as a mount. Why? because a rider can "spur" its mount for 2 hp damage with a ride check and the mount can move an extra 10 feet in a movement. So this toad, on my head, with 8-foot stilts, has TINY SPURS on the bottom of those stilts and can STAB ME with the spurs, and thus make me RUN FASTER.
Or when I gave my toad familiar glory tongue which gives it a 100-foot tongue that could extend or retract as a free action. Free actions are unlimited and take no time. A glory tongue is a construct, so it's considered a creature. So, for 1 power point, I could share it with my familiar and he could lick everything within 100 feet.
This would either trigger traps or if he couldn't move his tongue through a given square, reveal invisible creatures.
I would always share pain with my frog's glory tongue, so if I took damage, half the damage would be transferred to the tongue. If I get hit with a fireball, my toad's tongue explodes out of his mouth in a burst of flames.
Glitches in the simulation; when you take the rules from a system and apply them to a situation in the real world, it will never match up. You will ALWAYS have problems. Usually at the extremes. Most players like to mess around with big numbers. I love messing around with the small end. How to move five feet for free. How to tack on just one more +1 damage. How to use multipliers to take multiple different types of damage to get around the multipliers don't stack rules. How to use strange damage types, untyped damage, or any odd, strange, or unusual unique rule.
That's where you get the most glitches,
When they first came up with persistent metamagic, they forgot it could apply to time stop. So instead of a few seconds, you could stop time for 24 hours. They had to actually pass a new addendum to state, YOU CANNOT PERSISTENCE TIME STOP.
When you say:
I have seen this in some of the system novel with stats where mc's stamina drop to zero but they are still attacking with full strength.
All you are saying is, "THIS SIMULATION IS POORLY THOUGHT OUT."
They are all poorly thought out because it's a simulation. Some are less poorly thought out than others. That simulation isn't as realistic as others. This is the flaw in any RPG. This is why I always say LitRPGs need to LEAN into the simulation. Point out the flaws and the MC's exploitation of those flaws. Any LitRPG that is trying to be realistic, is gonna fail.
You CANNOT be realistic when Pi = 4.