Inventory management in ESO sucks in general. Characters have individual inventory slots with a scaling cost to expand them, the bank has a scaling cost to expand it, inventories in houses are limited and awful, it's all an absolute mess. I wound up just using all my spare character slots for inventory mules and trying to juggle that was awful.

And it's intentionally bad because premium doubles your inventory and bank capacity too IIRC. So it's creating a problem for the sake of selling the solution. ESO's monetization is awful and is basically aimed at trying to sell yearly expansions alongside a subscription service with extra anti-QoL shit like mount training (mounts are cosmetics, so individual characters have mount skills which you can get one point in per day, which you need to make them fast, able to run further, etc).

Imo everyone who likes TES should grab it free and play the base game, and then quit because the base game is roughly half of the total content, it's the most complete and coherent content since it wasn't chopped up to be sold piecemeal, and if we're being honest the DLC stories are kind of shit. Like three guesses what the Summerset storyline is. That's right: "the dumbass racism elves are being incredibly racist dipshits again, and they're about to cause the apocalypse through sheer stupidity, again." The Skyrim DLC arc is just "something something vampires, is anyone even paying attention? No? Yeah it kind of sucks not sure where we're going with this and oh hey you won let's just forget about this shit now." The Elsweyr DLC arc is just "Skyrim, the game, but in a jungle now." The Blackmarsh DLC arc is just "Oblivion, the game, but in a swamp now." And that's where I stopped playing, so I don't know what either of the last two are but I understand High Isle was dogshit.

Really no one's missing anything of value if they skip the DLCs. Just do a main faction story or two (I recommend the Aldmeri Dominion and Ebonheart Pact for the scenery if nothing else - Daggerfall is the blandest and most boring place in the entire game, only picking up in Hammerfell) and the Craglorn stuff, maybe the Vvardenfell story if you're nostalgic for Morrowind (the story itself is incomplete - it continues with the Clockwork City minor DLC and Summerset major DLC) and so dull I couldn't tell you what happened, but Vvardenfell's a cool place to wander around in), then quit while you're ahead and still haven't spent a dime on the game.