Honestly those three are not bad cantrips. I can understand wanting to try some other stuff and whatnot but those are really good cantrips nonetheless. I can be happy those. And besides there weren't a ton of cantrips to choose from in the game...even in the footage of the final game. The big one that Warlock was missing access to was guidance.
I agree that guidance and thorn whip are good choices, not sure I'd ever pick vicious mockery though, but the point is that it feels unnecessarily restrictive, I can't imagine any reasonable justification to why they'd make these choices for us.
EDIT because there were new posts while I wrote mine.
I don't think they did this specifically for the intrinsic joy of refusing to give you choice. It can be difficult to always get things to work as intended in a videogame.
Sure, I don't believe that they did this just to spite us, but there have to be other ways of implementing this other than taking the shortcut and choosing for us. I don't think it would be unreasonably complex to create a new spell pool for this feature that includes versions of all the available cantrips but with CHA as their spellcasting ability.
