No more 'childish' or 'unprofessional' as these imo:
I don't personally see there being any reason to change it, it's not offensive and entirely optional in your exports anyway.
I will say I have no idea what the logo is supposed to represent.
Unreal being a giant U makes sense from a brand perspective.
Unity being a mishmash of a default cube and the XYZ gizmo makes sense also as both are related to gamedev.
Godot's logo is...? I think some kind of internal reference only the original devs know? Obviously it's a robot's head, but WHY is it a robot's head?
Would be good if the logo had a docs page that explains the history and maybe what previous logos if any were?