1) Charisma is totally irrelevant with Guidance and save scumming dialogue rolls anyways. There's not a single persuasion/intimidation check my elven druid had trouble passing, and it would have been even easier if I was Drow.
2) To a single class, and maybe 2 more down the line. That's still out of druid+fighter+rogue+wizard+cleric+sorcerer+warlock+paladin = 3/8 classes it is only relevant for. Dexterity is relevant for all of those.
2b) Let's change the racials, because the result of this racial is you pigeonhole a race to 3 single classes or have your stats go to waste because charisma is worthless in combat if you're not 3/8 of those classes as it currently stands.
3) These are almost never used, and when they are, higher AC is more valuable anyways since you can end up dodging the attack altogether. Furthermore, there are potions which grant you fire resistance, plenty easy to acquire, and these don't stack with the Tiefling racial. There are no potions of dexterity or initiative, and the thing about Dexterity is that it never becomes redundant or has diminishing returns, unlike the fire resistance which has a stack limit.
4) Even if it didn't require concentration, what would it do? Doesn't have enough base strength to even push enemies, and at best you'll be dropping some items on the ground next to your character and have the hand toss it. There's really not much in term of interaction the hand can do for you. Not remotely activate buttons safely or deactivate traps, etc.
Tiefling racials are hot trash. I could understand if the lv3 skill compensated, but it's utterly unreliable, so another Guiding Bolt gimmick in the grand scheme of things.
1.) I mean, okay, if you bring in savescumming then skills check bonuses don't really matter. But the goal should be to
not savescum, right?
2.) Out of 6 stats, 3/8 Charisma classes is overrepresented. I agree that dexterity is an uber-stat that is too OP in 5e, so the classes that don't get it are usually worse (except for Heavy Armor characters). But D&D isn't entirely combat, and especially given BG3's binary pass vs fail of dialogue checks, Charisma is decently important (again, ignoring savescumming because games shouldn't be balanced assuming it)
2b.) If Larian goes the way of Tasha's, where any race can get any +2/+1 bonus, then I could agree that tieflings should be buffed a bit.
3.) I think there should be less consumables in BG3, which somewhat addresses this. But yes, there are no potions of Dex +2
4.) Mage hand
should be able to remotely activate traps or pick up items from far away. That's a HUGE use for it in PnP. Stand around the corner and have the mage hand open the chest. Or open barred doors from the other side
X.) Burning hands is a bit useless for a ranged caster I'll admit. Hellish rebuke or darkness would be better.
Edit: Totally forgot about Paladins. They need Charisma too