Players rejoyced when it was revealed that Patch 1.1.1 will add a free Stash tab in Diablo 4 — but then the questions started pouring in. Why only one tab? Wouldn't more be better? Were features being purposely held back so that they could be monetized later? It doesn't seem that there's any nefarious purpose behind the slow rollout of Stash space, however — there's a technical purpose.
Diablo 4 Associate Game Director Joe Piepiora clarified the situation a bit on Twitter, stating that Stash tabs are memory hogs. Whenever you encounter another player, be it in Kyovashad or out in the wild battling enemies, the game loads not only the physical character and gear, but also that player's entire Stash.
Blizzard is working dilligently on a fix for this problem, so more Stash tabs are likely on the horizon. It'll just take a bit of time — we don't know how long, but hang in there! Patch 1.1.1 Adds Free Stash Tab Campfire Chat Developer Summary
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