it begs the question of why spells like this are even in the game, except to waste people's time. It's just always better to cast Hold Person... so why even include it?
They're included because they're in PHB.
Larian chose to remain very close to PHB in terms of content, which is why Acid Sorcerer is gimped with its 1 spell and 1 cantrip that can deal Acid damage (With the plethora of good Acid spells from Tasha's Cauldron that make Acid Sorcerer actually useful being omitted).
It's also why we're capped at level 12, since later level PHB spells wouldn't function properly in the game and instead of simply omitting problem spells or homebrewing them into something more suitable, they just left us with what we have.
Web and Grease get fire spammed instantly and can never do their jobs properly. Because it's more "fun" to always turn them into a fancy explosion that deals a whopping 1d4 damage? Entangle and even Plant Growth get incinerated instantly with any fire contact. Any excuse, really.
To be fair, this is Larian. They're have a special attention to making sure surfaces react to elements, so it shouldn't come as a big surprise.