They have to look different from each other so that I can find them but otherwise no, I do not care how the icons look and I have never met another android user that does either. While there are third party launchers for android to customize your user experience and they allow you to change icons I have never met anyone that uses launchers exclusively for that purpose.
The reason I am talking about iOS is because that is what we are talking about. iOS has a system to pay for app icons and Android doesn’t. Paying $5 for an app icon is alien territory for me.