"Help" isn't into dnd. And yes it trivialises the encounter when you can simply healing word as a bonus action with Shadowheart.

Help is however often in tactical RPG and I understand why Larian would want something like this to help the players having a familiar mechanics.

I have would opt to go the middle path and replace help with stabilize (e.g. xcom) another tactical RPG standard that stop player from bleeding out, is more realistic (not everyone is a cleric), and not game breaking.

I would also introduce the throw potion healing mechanics into the tutorial somehow to make them familiar with it.