But not, apparently, in any way that you are able to articulate. For example your designer feels the idea is childish, but if your agreed-upon strategy is to position your firm as the most friendly and accessible vendor for new buyers that might be OK. If you want to be the safe choice of professionals, then maybe not.

Taste is highly subjective, but your designer is a specialist in visual communication and literally sees the world in a different way from how you do.