As i've said, spell slots exists even on mainstream console ARPG games like Dark Souls 1/2.
And permadeath rarely exists and when exists is as a option.
This doesn't look like rocket science
I told you that not everyone who plays BG 3 will have ever played D&D before. You countered with "spell slots exist in Dark Souls". Let me try this again.
Not everyone who plays BG 3 will have ever played D&D
or Dark Souls before.
Games need to explain their systems to the players. Sometimes, they do that so well that players don't even realize they're being taught.