So a stable release is too unstable for them? And now the first thing users will have to do is after install, apply all the bug fix packages to bring it to 14.04. But that will bring no unstability concerns? Or will they just not patch it and expose themselves to the bugs in the name of stability?
That's incorrect. The way you apply bug fixes to 12.04 LTS is by installing the bug fixes, not by moving to 14.04. The whole point is that 12.04 LTS continues to get updates for 5 years.
It's not that it's unstable in an absolute sense – but it is a migration if they started building this prior to 14.04 release (highly likely). And migrations are always time-consuming and risky, even if it's a migration to an otherwise stable platform.
