Baldur's Gate 3 player uses D&D math to explain why Shadowheart's Firebolts always seem to miss

gamesradar.com:

I recently started my second proper Baldur's Gate 3 playthrough since defeating the Brain earlier this year. As is pretty much par for the course, it wasn't long before I'd recruited Shadowheart, and as is also par for the course, it wasn't long before I was rolling my eyes as every single Firebolt she threw missed its target. 

Shart's wonky aim has been a talking point among the community for a long time, and while I assumed it had something to do with the fact that she's a support-based cleric rather than a dedicated battle mage, I'd never worked out exactly why she seemed so deeply incapable of hitting her mark. Of course, within the annals of the D&D rulebook there's a reason for everything, and one player has pulled out the answer to my specific conundrum.

Depending on your character creation choices, in the first few hours of Baldur's Gate 3, chances are you'll get most of your access to Firebolt via Astarion, Shadowheart, or Gale. While the latter picks up the Cantrip due to his wizardly powers, the two former Origin characters gets theirs from their Elven ancestry. Astarion is a High Elf, and as such starts with a Cantrip of Larian's choosing, while Shadowheart is a Half-Elf who takes advantage of her High-Elf Heritage to also take a Cantrip of Larian's choosing. In both instances, that's Firebolt, a simple spell that deals moderate damage, but which is also helpful for easily setting things on fire.

The thing is, most D&D spellcasters link their magical ability to a specific ability score. A Wizard, for instance, uses their Intelligence to enhance their spells, while a Warlock or Sorcerer uses Charisma, and Druids and Clerics use Wisdom. However, as noted on Reddit, when you learn Firebolt as a racial Cantrip,