If you think that the step from a command line to GUI, multitasking OS is anything at all like cramming an 'X' or 'Live' into a bunch of disparate technologies, then I don't know what to tell you.
Edit:
from a marketing perspective, it may be perfectly logical to give disparate names to tangentially related technologies.
Please explain the logic of 'X' and 'Live'. From where I'm sitting, they're just aliases for '1997-2003' and '2005-2010' (numbers purely guessed). It added absolutely nothing of value for anyone, aside from the marketing team.
Quitting the devil's advocate role and in support of your position, if nerds had their way, the entirety of marketing and design would be annexed in favour of technically aesthetic solutions (functional product names, stable UIs, uniform web designs, ...), but sadly when speaking of the masses, buying choices are simply not driven by rationality. My ideal world will probably never come, at least in this lifetime.
Some of the names you mention are indeed related, but branding and marketing are entirely different beasts, and from a marketing perspective, it may be perfectly logical to give disparate names to tangentially related technologies.