working big muscle groups to full ROM = body increases testerone = jacks you up
The Chinese do a fair amount of overall bb exercises. I read somewhere that the coaches believe chinese people don't have the upperbody development/ strength as other lifters so this is why they do it. Sorry I can't remember the source.
All good lifters will have well developed back, legs, traps, lats and eventually shoulders. If you add in bench press, chins, dips and curls you will be well rounded.
It isn't that hard to pack on muscle if your already hammering your OLifts properly and eating lots.
You will definitely lack chest if you never BP/ push ups as thats the one area that the OLift does not hit. Biceps as well but your arms will get thickness from general size gains but your chest won't.