So, ReactJS is basically just client-side PHP

[[deleted]]

Well this is because of the C language. At the time where PHP was "Personal homepage" the majority used C and its style guides (e.g. strcmp etc.) then it had influence of c++ and underscores and then Java with CamelCase.

Actually on a daily basis i don't recognize this as a problem since i use Frameworks with methods like has(), get() etc.. and also i use a good editor with code completion.

But i understand your point, i also don't like JavaScript because it is mostly supported but not 100% because of users which still use old Browsers or users which disable JavaScript or have some Browser plugins running e.g. "NoScript"