Issue is support for the hard wear and soft wear you use to do said tuning. I use HP Tuners, and we have updates to the soft wear as time goes bye every so often. I think since I bought my MPVI2 and started tuning mine there's been at least one update, and there not usually small updates. They add can add quite a bit to the program, mostly new tables that the previous versions didn't have in them. Now if say the EPA were to go to HP Tuners and say you can no longer sell or support this product, you no longer get any support, your on your own. I,ve had this happen to me once with my Cobb stuff for the 2013 Fusion I have. They only supported 2013 and 2014 Fusions, and about 3 , 4 years ago they dropped us all together. I still get updates for the Accessport interface, but that's it, and they are mostly just to make it work better with other platforms. It all boils down to the EPA turning things into nice expensive paper weights, they like doing that these days.