Wyll's default stat block is terrible.
Honestly, it's not that bad.
It's only issue is the lack of DEX which is notable for a class that only gets Light Armour proficiency which is the same as for Gale (Gale and Wyll have identical stat blocks with just INT and CHR mirrored), which people also find somewhat squishy. Though Warlocks get access to a plethora of tools to aid their survival like Fiendish Vigor, Dark One's Blessing, Dorkness, Hunger of Hadar etc. I suppose Shield makes survivability more favourable for Gale because that's a great spell (Not so much early on when you're still relying on level 1 spell slots for damage)
I've seen people complain about Wyll not hitting things, but that makes no sense. He literally has maxed out CHR so he has the full +3 bonus on his Eldritch Blasts (And Rapier if you go Pact of the Blade) and can toss him the Melf staff for an extra +1 just like Gale with his spells.
Shadowheart has by far the worst stat distribution of any origin character. 13 STR, 13 DEX, 10 INT and Clerics having trash cantrips means she can't hit with anything. Both types of melee weapons and all ranged weapons are useless with only +1, her Fire Bolt is useless, Sacred Flame is useless leaving her with only Produce Flame which is annoying to use...
