As far as anyone knows. There has been a significant amount of development on GH 1.0 for Windows that happened after the code was ported to Mac. Since the porting itself is a lot of boring work we’d have to do it all over again if we decided to merge changes. It’s unclear at this point whether we have the time and inclination to do so.
Grasshopper 2.0 will be developed from scratch to run on both Mac and Windows so this problem will go away eventually.