I hope someday they'll do that here, too...

There's this game from 2006 called Titan Quest. There is a very convenient function in it, as for me, to organize things so that there is more space (by pressing a button). Plus there are several options for the distribution of things if they are different. And it can be done in Stash and in the character's backpack. Maybe and in the POE will do the same someday, it would not be bad, than every time you in the cells to drag and drop to free up space.

You want them to make all these futuristic upgrades using barely comprehensible technology!

(Dungeon Siege had this in 2002, I bet there are earlier games as well.)

They said they dont want to add such thing. It awas asked multiple times over time.
You need to "feel the weight" of items you pick ;)