I’ve got over 2,000 hours and I’ve never used a stash mod and still have empty space in my stash.
I am absolutely one of the players who would stash everything if it was infinite and then never want to look at the unorganised mess once it got to a certain size, case in point my PoE standard stash is over 600 pages and I just don’t want to deal with it. Also, I know this is anecdotal at best, but I do have a friend who stopped playing precisely because his GDIA stash got so big he didn’t want to deal with it.
I’m quite happy with the current situation. If you want infinite stash space, there are mods and for everyone else, there are choices to be made and a cap on the “mess” that you can create.
I honestly don’t understand this aversion to using mods that already do exactly the thing you want to do.