The first retro corrected the flaws and left pretty much all the good stuff intact. Simple as that.
If you really think about it, this whole idea that the original version has to be the best really makes no sense and literally applies to almost nothing else. Is a computer from the 80s better than a modern one? Almost everything improves over time. There’s zero reason that we wouldn’t be able to improve something as simple as a sneaker that was designed and manufactured in the 80s. With JB, unfortunately, we’ve been conditioned to accept lesser versions over and over again but that really is only because they want it that way. They quite obviously tried to improve things with the original 1,3,4, and 5 retros. At some point during 2000 or so something changed and they made the business decision to veer sharply away from that concept and decided to destroy the designs rather than make slight improvements.