So throwing a fit and leave every time something that you get hired to do and payed for is not going the way you want it to is the definition of professionalism now? Okay....
But there were "mitigating circumstances"
Don't ask me how George Perez, Alan Davis, and countless others were able to enjoy lengthy careers at both Marvel (M***** for you JBF members!) and DC without these "mitigating circumstances"
creeping up. For some reason, Byrne just happens to have been notably unfortunate in that regard.