That's because *you* like electric-indent-mode. Not because C is special.
Electric indentation is more useful in a language like C than it is in
something like Python --- C has a richer set of brace characters.
Right: Python is indeed special because fully automatic indentation is
not really possible. But C is not special in this respect.
cc-mode's sophisticated syntactic indentation is an Emacs "killer feature".
The "sophisticated syntactic indentation" is also a killer feature for
Octave users, SML users, Lisp users, Javascript users, ...
Anyway, we should be showcasing it by default, using electric
indentation, instead of hiding it behind configuration because users
might want to lobotomize their indentation by rebinding <tab>.
That's arguing for changing the global default of electric-indent-mode.
Whereas this bug report is about changing cc-mode to follow the
global preference, whichever way it's set.
Stefan