Not all progress is forward. The second edition of a book may fix a few grammatical errors. It also may edit out a favorite line that’s no longer in line with a publisher’s sensibilities. The newer model of a car may have more features, but be less reliable mechanically.
People change things for lots of reasons, and at least one of those reasons is “because I want to continue to have a job.” Just keep that in mind – the old version isn’t automatically better, and neither is the new version. Some things just compete against themselves.
The Opportunity Machine 