I'm thinking of buying a new MacBook Pro, with the intention of it being a mobile extension of my workflow for which I currently sit exclusively behind a 2015 5K iMac running Sierra. I purposely haven't upgraded to High Sierra due to the fact that (a) I have a Fusion Drive and (b) that I have also seen that reaction to the updated OS has been mixed. If I get the new MBP, it will obviously come with High Sierra factory installed, which features all the new file formatting features that Sierra does not. As I will be moving files between machines a lot, I'm worried that fundamental differences between the 2 versions could possibly raise issues that at the moment I can't think of but I'm considering all future possibilities. Is this something I should concern myself about?