I think it’s possibly because they look like something a Middle Aged woman would wear. ( I am one, so no offence meant!)
Obviously, I’m an achingly hip woman (like many over 40’s I know) and I’m afraid I agree. They are a bit ‘safe’, middle of the road.
either go for a chunkier heel, or go all out with a spiky heel if you want something dressier.
these boots have been worn by the head of the French department since I was at school!