Huh. Interesting. Grease in kingmaker is probably the most powerful early game spell. I would think this translates to Baldurs gate too. Not so much in real world dnd where there will be fewer enemies and more theatre of mind.
utilizing elements is a little bit less useful in Baldur's gate because of the action economy. In divinity you had action points where you move things around with telekenesis and light them on fire in one turn, it's harder to get the ball rolling in BG3
Making it flammable sounds very powerful.