You do. they’re the only “pay to win” aspect of the game. You need premium stash tabs to use the trade site functionality and managing a lot of the drops really requires stash tabs. However, you can get what you need for $20-30. I actually ended up buying supporter pants in a “Take my money!” kind of way because of how much time and enjoyment I’ve gotten out of the game. You can absolutely get in and play without stash tabs, but if you want to get serious about the game they’re pretty much required.
Thank you, Last Epoch!