When I first saw Fire Bolt was a d6 I was shocked, because it's supposed to be a d10 and is a Wizard's bread-and-butter offence.
Then I realized that they split it into d6 direct damage and d4 field damage. Okay... I can live with that.
But... At level 5, it supposed to go to 2d10.
I'm guessing it's only going to be 2d6+d4 though. So only 3-16 instead of 2-20. That's a bit of a handicap and is going to make Wizard's far less useful.
So, I get that the whole "fields" stuff is sort of Larian's "thing", but just to ensure that Wizards don't become a liability at levels 5+, I think that maybe they ought to revert it to d10 with no field.

Or, if they really want to keep the field, do something like d10 and create a field, but the field only does damage if the target doesn't move out of before the end of their next turn? Don't know if the engine could handle that though.