Mixing of logic and presentation is bad for application, but so don't use <font> tag in your code, because it will be hard for _designer_ to change appearance o

Mixing of logic and presentation is bad for application, but so don't use <font> tag in your code, because it will be hard for _designer_ to change appearance of hardcoded page. React mixes logic and structure, which causes no harm, because both are written and maintained by same developer.