Well, normally death and dying is supposed to be a big deal in DnD and lore-wise in Forgotten Realms. The very cheap 200 gold revives kind of cheapen this a LOT. It is not neccesarily a plothole (as you would not just kill someone to cure an affliction like that just to raise them, a normally VERY taxing and draining experience for the soul), but it is more the case where it clashes hard with how available raises and ressurections are and how much this has cheapened death.
As a comparison to 5e from a mechanic point of view, Revifiy as a level 3 spell has a 1 minute limit before a body cannot be raised from the dead anymore AND it requires a diamond worth 300 gold. Raise dead as a level 5 spell (so much higher already and much less available) has a 10 day limit but requires a diamond worth 500 gold. Oh, and an hour cast time, so an hour of uninterrupted chanting and rituals and stuff. The better ressurections are likely beyond the level cap limit but are even more expensive.
In earlier editions, you would even lost exp for being raised from the dead, or require checks to actually succeed. Coming back from the dead is a huge drain and intense journey for the soul and is meant to carry weight. Dying in BG3 is just a case of 200 gold really, the Phoenix Down idea that you can just stock up on. It is a game-mechanics decision that kind of ignores lore and actual raising of the dead in dnd.
So it is less a plothole and more a result of a change in mechanics by Larian really
