Grunker
RPG Codex Ghost
The inventory thing isn't exactly about 360-degree-realism-at-all-costs, although going for a more realistic approach would've served the game just fine, but about sacrificing in-universe logic to cater to lootwhores (with all due respect to whores). In-universe logic breaking arbitrariness wasn't needed there.
But did it hurt something? As I said, if there's a tangible benefit to it I don't mind it that much. Inventory mechanics have always been arbitrary - in Baldur's Gate you're carrying around five full sets of full plate, hauling it back to town. There is no difference between the completely unrealistic packmule characters of most RPGs and a teleportation device.
Hell, I think portable merchants are shit gameplay-wise unless you really have to earn them in the game (like after a hard fight in a secret quest), but they actually make the most fictional sense of any of these concepts