pros & cons putting formula header files c++?

you structure c++ way (almost) formula resides header files. radically looks c# java program. however, need during slightest .cpp record lift header files compiling. i know definitely withstand idea. nonetheless i haven't found any convincing downsides doing this. i list advantages:

[1] faster accumulate times. header files wholly parsed once, since there wholly .cpp file. also, header record can't enclosed some-more once, differently build break. there ways achieving faster compiles controlling swap approach, nonetheless simple.

[2] avoids spin dependencies, origination definitely clear. classa classa.h spin dependency classb classb.h, i have put disrespectful anxiety & sticks out. (note graphic c# & java where compiler automatically resolves spin dependencies. encourages bad coding practices imo). again, prevaricate spin dependencies your formula .cpp files, nonetheless real-world project, .cpp files tend consolidate futile headers until can't figure out depends whom.

your thoughts?