Yes - totally! You either limit yourself more or double/triple your work making different system API calls depending what platform you're compiling for. Not too

Yes - totally! You either limit yourself more or double/triple your work making different system API calls depending what platform you're compiling for. Not too different from tripling your workload to support "offline" applications or dealing with IE/Safari/Chrome/Firefox differences. Most web apps I've come across either don't run in IE or have various bugs/issues in Firefox as most of them are coded on and targeting Chrome due to Chrome's dominance of the web. Which reminds me of people building/testing only on Windows. I will admit that the comparison I'm drawing are "same but different" problems. Browsers are a lot more standardized than operating systems and fixing a difference between Firefox/Chrome is usually a lot more trivial than fixing a difference between Windows/Mac.