I was unaware that it was a part of D&D as i never seen it in any of the games that i played- and i played a lot, albeit it seems to be limited to sorcery? In pathfinder you can use it with all builds which may be why i am confused. So when I suggesting it i am suggesting it for all classes not just caster. Some examples of the ones i would want to try, but would not be able to do? Taking 3 in sorcery is out of the question if BG3 only has like 14 levels. I want them in feats.
Selective:
Eg: Cleric of death domain: Mass inflict injury is not usable without selective meta magic. Yes arguably op
Eg: Bard: Cloud of Daggers: Arguably OP, but situationally useful
Eg: Power Word- Slumber / Sleep: Putting your own team mates to sleep always causes me to throw a fit of rage
Heighten:
Warlock: I would want to use heighten spell on eldritch blast, being able to blast your enemies 90M seems fun as all hell
Paladin / Oathbreaker / vindicitive bastard: Smite or channel energy for healing / dmg.
Druid: Sickening entanglement or Sharp stones