There are many reasons to not allow players to rename potions/poisons which can be sold/traded to other players, including confusing or intentionally misleading and of course those who take any little opportunity offered to be… immature.
But for my own use, having a potion called, for instance Essence of Magicka when that is only the first of several effects is not at all helpful. I have to look more closely in inventory to distinguish what I need and will probably end up turning some in with alchemy writs, etc. If I had the option of giving crafted potions and poisons names meaningful to me (with the tradeoff that they become account-bound), that would help me keep track of them and use the right potion/poison at the right time.
(Edit: corrected typo)
Edited by Araneae6537 on 25 December 2021 16:29