All users know that Linux developers like and support in every way the diversity of versions which support various incompatible things whether they are really useful or not.
It is enough to look at the md-raid superblock that is known to have at least three "just a little" different versions. Most of them differ only in a location of a superblock in relation to the array contents. Such a difference can result in several unexpected consequences, e.g. you want to recover NAS manually following the instructions at www.nasrecovery.info, but Linux is not able to assemble NAS because it is not able to see a single superblock.
In my opinion, those who develop Linux are just a little mad at a location of a superblock. As a consequence of all this - with enviable regularity another Linux version with a new superblock location is released.
