If that isn't exactly what the send to camp button was for to begin with, then what was the point of it?
Well choosen words.

Exactly this, but there is a catch!
You know, Woodaxe is great tool to chop things appart ...
But does that mean its purpose is to separate limbs from other people bodies?

And thats the point here ...
Obviously i dont *know* (duh) since i dont work in larian and they never bothered to comment on any of this.
So all i can take under concideration is common sense.
And my common sense say, that if usage of something bypass, or even worse completely negate "some other rule" then its not used properly.
If we are supposed to send any heavy armor that would case encumberance to camp ... why encumberance exists in the first place?

If we are supposed to send any food that only incerases our carry weight to camp ... why there even is carry weight in the first place?

Therefore logicaly ... we are NOT supposed to send any armor we cant carry around, and every piece of food to camp ...
What is the point of this button then?
Well, easy ... its there for us to "send things we dont want to carry around in camp" ... just as you said.
But there is important difference, between sending things to camp in order to keep them in camp ... and sending things to camp in order to just leighten your bag, and pick it back few moments later to either use (food) or sell (armors) it.
And that is its purpose in my opinion.
You know, many players are sentimental ...
I, for one, really like Shadowheart's starting armor, so i never sell it ... but when i find better one (wich is soon) i want to keep it anyway.
Without "send to camp" button, i would need to return to camp, find a box, and drag it there ... nothing that would take too long, but still unnecessary delay from the actual game ... so i click this button and the armor is stored for me.
And i dont see this as an exploit, bcs this isnt something that would "just free my inventory for now" ... i would store that armor anyway, this just make it faster and more covenient.
Same goes with Magical items ... i loot some really nice Heavy Armor (for example) but no one in my party actually use Heavy Armor ... i can sell it, ofc ... but i dont want to, bcs i know from Larian AMA, that after Act I. something will happen to my party, so i presume there is possibility that this armor will be usefull in the future.
What would i do? Store it obviously.

The same process as abowe ... click and done ... no need to bother with teleporting in and out.

Same goes with story artefacts (you know, Iron Flask, Staff of Crones, Book of They, ...), or in other words, things that Gale wants to eat. Ofc you can feed him every Rest ... but if you dont want to, why drag 4 story items with you all the time, if you dont plan to use them in any way?
And as you probably guess > store them!

So ...
In conclusion this button itself allready is just QoL feature.

I think calling it an exploit is wrong because of just how OBVIOUS that use is. To me it seems so obvious that it can't not have been intended. There are things like gaming stealth systems or the approval system that players at least have to think about and realize they can do.
I respectfully disagree ...
And as any person who ever tryed to desing "user friendly interface" will most likely confirm to you, there is no such thing as "obvious use".

Bcs no matter how hard you try, no matter how obvious you make things ... there will allways be someone looking at it and saying "How the hells was i supposed to know that?".

Same things goes here ...
Abusing stealth, or approval may seem like something you "have to realize" ... but that doesnt mean they actually are, it only means they are that for you specificaly.

Person that will never even bother to try stealth in Heavy Armor ... never find out how easily Stealth can be abused.

Person who would never even think about donating gold to a vendor ... never find out how easily they can get the same (and much more) gold back, bcs their approval gets so ridiculously high.

In my vocabulary, exploit is a thing that helps you bypass, or negate a rule ... doesnt matter what rule ... doesnt matter how hard it was to find that exploit ... and it doesnt matter at all if developers leave it there on purpose for you to just mess with things around, or if they just oversighted this possibility.
You dont follow set rules > you are cheating ... or exploiting in this context, simple as that.
Sending all things to camp bypass carry weight rule ... therefore sending things you would otherwise carry around to camp (no matter if its armor, weapons, food or anything else) is exploit.
Feel free to disagree with me, but thats how i see it.
That said, just for the record ... no, i dont really care how much people are using exploits (this one included) ... and yes, sometimes i do that aswell.

But i honestly see little to no reason from Larian to negate their own work (you know, implementing carry wieght and food as limitation for long rest) by allowing us to abuse their function even more than they allready allowed us (willingly or not).

Hope we understand each other better now. ^_^