not a fan for reasons that op states - mainly throwing potions to heal companions infringes on other class roles/abilities, not to mention it also doesnt reflect RAW which indicates using a potion is an action where you actually drink the potion.
i know bonus action for using a healing potion is a common homebrew which i could get behind, but chucking a potion to heal an ally is just foolish. so much so that ppl in these very forums were posting gifs of ppl getting smashed in the head with glass bottles which doesnt sound very restorative to me lol.
also i would be worried as to how larian implements/balances it in game - not a fan of enemies using this functionality or the continued use of surface effects with potions/consumables. and will larian implement any rolls associated with throwing potions/consumables in general or just auto-success - seems a little too powerful.
