I don't know what Rubén's reasons are although having experience in this
area I can tell you why I'd plan for a release 6 months after the release of
the derived distribution. For one I wouldn't have to worry about bugs
unrelated to the changes I've made. A stable distribution means I don't have
to fiddle around with unrelated bugs. Rubén doesn't want to have to fix bugs
upstream that are going to be fixed anyway should he simply wait for a final
release to start working on it. Two is it wouldn't get in the way of my
income (Rubén's got another job). If I'm busy working on a project for my
job and the deadline comes out to be the same time of Ubuntu's planned
release I'd not have the time to work on Trisquel. However if I know I have
an insane amount of time (a 6 month window) to get a distribution out then it
doesn't matter if I work on it this weekend or a few weekends from now. I
couldn't wait until I had the time to work on it.
If anybody isn't a member please consider becoming one:
http://trisquel.info/en/member
I'd suggest contributing as much as you can reasonably afford. $10 USD / 8
EUROS a month is about what the average user of a proprietary system spends
on licensing a month. This only takes into account word processing,
anti-virus, and OS licensing costs. It doesn't take into account virus
removals and other costs.
There are also items in the gift store which Trisquel gets a percentage on
(unsure how much):
https://trisquel.info/en/store
And computers, accessories, and various other merchandise @ ThinkPenguin that
Trisquel receives 25% of the profits on:
http://libre.thinkpenguin.com/