Okay, gotcha; sorry for being kind of aggressive on how I formulated that. I was just kind of confused on the question.
I wouldn't know about changes; I only know that when I started using Jon Cone's inks, they worked well for me right from the get-go. I transitioned gradually towards them so for a while I was printing with their 3rd party inks and Epson inks side by side. At that stage, I was not running a calibrated process, so all I had was visual impressions, and I never noticed any difference between the Epson inks and the Cone inks. There may be a difference in archival stability, but it's beyond my capability or interest to test this.
In principle I would expect that things would have changed in the meantime; an inkjet ink is a fairly complex product and it's almost guaranteed that improvements are introduced periodically even if the confectioner (like Cone or InkOwl) themselves changes nothing substantial about the formulation. There can still be changes in the dispersion system for instance, as the confectioners in all likelihood buy their pigment dispersions just like most parties in the industry (except for the really big guys with a serious in-house R&D capability).
it’s a non-issue for the P700 and P900’s, as the firmware is locked down for printers sold in the US market.
Or maybe elsewhere as well? I looked into getting a second printer some time ago and my conclusion at that point was that the only viable approach would be to get another second hand 3880 and then hope it wasn't shot by the time I got it. At least there's a reasonably healthy spare parts ecosystem for that type.