at least i certainly like the idea that NPCs would after few rounds be forced to change their position instead of keep sniping me from abowe forewer.
I did read until the end. I just didn't comment on that line specifically because running out "after a few rounds" would mean an arrow limit of like 5-10 arrows, which heavily penalizes ranged characters. An argument I had already made earlier in my post.

Though I'm not necessarily opposed to this specific idea. Limited ammunition doesn't need to be implemented for PCs for this. There can be limited ammunition for only enemies, or they can be coded to enter melee after a few rounds of firing for variety.
Just wondering ...
What would you think about expanding them for other mechanics ...
I mean, what is requiring food for Long rest, if not "needless tedium because it's negligible cost" ?
Just as with arrows, there is enough of food for you to never worrying about it again ... sure it weights a lot, but since you can easily send it to camp, is that really and issue?
The current implementation of food IS needless tedium and poorly implemented. See all the threads on food. There is too much of it so it doesn't achieve the goal of limiting long rests, and it's too tedious to use. Food should be gotten rid of or overhauled.
Also what is possibility for Lockpick to break, if not "needless tedium because it's negligible cost" ?
I think Lockpicks shouldn't break for exactly this reason. Or they should cost more.
And if we get to at absurdum, then concidering that we are totally able to long rest every and any time ... is there even any reason to keep HP or spellslots? They can aswell just automaticly restore after each fight.
...? I'm not really sure what your point is here? This argument has already been made by myself and many others - Larian's decisions in BG3 effectively turn abilities/spellslots/HP into cooldowns that can restored after every fight. Either Larian should fully commit to rebalancing all BG3 classes so they're roughly equally effective in a single combat, or they should add more mechanics that limit resting.
All 3 examples you've given are mechanics that aren't implemented well in BG3. So for the same reason I don't like the food, lockpicking, and long rest mechanics, I also don't like the suggestions for having to care about common ammunition. Either it will be a useless mechanic, it will be tedious, or it will unfairly punish ranged classes.