ok first off let me say a few things..
kiting is not an exploit. it is a tactic. In other games you would kite mobs to more favorable combat points (so you don't aggro a huge group, etc) or to just simply kill things you would normally die to (in case of more hardcore styles where ranged players had huge defense nerfs so 1-2 hits and they died) so it became a functional mechanic since - forever. In reality, 'kiting' is an attack to lure enemies away, usually so another group of friendlies can sneak by or through an area that was previously guarded. Kiting - doesn't really exist in Grounded. You can 'sort of' kite slower critters, like lady bugs, but eventually if you get too far away, they just lose aggro and HP resets. Faster enemies, like spiders, will just catch up with you. Kiting is not 'attacking from a place they can't reach' that is more 'terrain exploitation' - and sure, given the current AI - I can agree that one is not really in the spirit of things.
Secondly - realism? You want, realism, in your survival game where you literally can respawn all you want, were shrunk down to the size of an ant, and never have to use the toilet, or sleep if you choose to? There is almost no realism here, especially when it comes to AI. You have to get rid of realism in games to make them entertaining, otherwise ... it is just reality.
Back to the quiver situation: carrying sling shoulder quivers or having a quiver attach to the backpack sides (allowing 2) is very much possible. As for how much they can carry - why are you going crazy on this? Look how much we can 'carry' now, then try to imagine what that looks like. Especially since it all 'crams magically into a tiny backpack". As per how many a quiver can hold, yes, technically 20, 24 is the upper limit of most quivers. Obviously custom made 'barrel quivers' exist, but we won't go there. But to keep to this 'realism' your making quivers essentially useless, as we already carry 20 arrows per slot. It COULD become useful if we had an equipment paperdoll section, and armor/gear were removed from the backpack and put there - allowing the quiver to be placed there and then the arrows inside it - but that isn't the case right now. Also - 20 arrows isn't even enough to kill most of the larger critters. You'd need to either shoot all 20, and then go melee it, or carry even more arrows - thus the issue.
as for the gas arrows - I'd like a balance if it's going to be lost. That is the main point. Either crafting more per gas sack, or simply increasing the damage/duration(both) of the fired arrow, making them much more useful overall, and at the cost the entire arrow is lost.
the venom arrows already craft 5 per venom, so I don't see why similar methods couldn't be used for gas arrows. Sure your 'realism' of attaching a gas sack has to go out the window, as suddenly now we split the gas sack into 3-5 parts without it leaking somehow, but again Quality of Life and Balance changes over realism anyday.
if you want realism, you'd suggest that regular arrows (and feather ones) have a chance to break upon use, even if they hit the target, as in reality - that is what happens. Most of the time, they hit a bone, or chunk of armor, or a rock or what not - and they break. The only time they don't really break is when they hit completely soft tissue, or a target made to be soft and re-use arrows. Essentially making every arrow shot - delete upon use. That means 2 things: 1 - players would either have to hoard stupid amounts of arrows and supplies to make them, or more likely 2- players would stop using arrows all together, as the amount of effort to keep enough ammunition to do anything other than 'killed 1 thing, going to get more' would be tedious.
You can then see the point there. If you go too far into 'reality' territory, you dull the game, make it tedious to get anything done, and generally speaking - players stop playing and move onto other games. If you wanted this to be 'more real" I'd suggest you rework the backpack system, we should have maybe 4 inventory spaces if your going with reality, along with maybe 6 hotbar slots. Doesn't sound like much fun, does it? (in this example gear would be worn, and your hotbar would be a few things strapped to your belt/side/back) because there is no way in 'reality' that backpack can fit more than 1 dandelion fluff, yet you can easily fit 10+