Sci
In 'Losing the peace' and ZSG it is directly established that the federation is internally unstable.
Sort-of. You're overstating it.
Losing the Peace established that the refugee crisis was threatening to create instability, but they
solved both the refugee crisis and the Alpha Centauri secession threat in that same novel. The only hint of internal instability in ZSG is a little bit of foreshadowing to PoD.
Not quite, Sci.
In 'Losing the peace', member worlds were thinking about seceding. A vote was organised and most voted to remain.
BUT, as per ZSG - which takes place AFTER "Losing the peace' -, this was not the end of political instability in he federation. Not even close:
In the book, there is a scene between Bracco and the kingon ambassador. The ambassador says ~'We're having as much trouble keeping ourselves together as you have, madame president. Perhaps more, because we conquered most of our subjects'.
AKA the federation is politically highly unstable during ZSG, as well.
If Canada would be unstable enough that its lands were seriously contempleting secession, to the point that Quebec would secede,
Quebec has been seriously contemplating secession for
decades, to the point of there being several referendums on Quebec's continued membership in Canada.
Has Quebec seceded? Are the other canadian territories thinking of seceding?
Canada is a model of political stability by comparison to present federation.
No. I think that a Federation composed of Earth and over one hundred other worlds counts as a Federation still intact. Remember, the Federation had just added its 155th Member right before the Borg Invasion. Even if we assume that the Borg destroyed 30 Members, that still leaves 120 Members -- 119 after Andor's secession.
Which could easily turn into 10 members in the very near future, if the current trend in the federation holds.
And stopping this trend requires actually fulfilling some - how did you called them? - 'impossible' orders/assignments/etc.
Don't count Vulcan as 'in' in the long run just yet, Truth:
In Titan;'Taking wing', is is directly stated that only a small majority was against vulcan-romulan unification - meaning a large minority was all for it.
You're overstating your case. That a plurality opposes something does not mean a large minority is for it. It's entirely possible for the remainder of people to be divided between people who are for something and people who are apathetic or undecided.
As it happens, 'Taking wing' specifically said not only that a small majority is against it, but also that a large minority is FOR the reunification.
It also mentioned that this 'large minority' could very well become a 'majority'.
'And that was when all was right in the federation, BEFORE Vulcan was half vaporised because two Earth-born human starfleet captains (Picard and Janeway) annoyed the borg enough that it came to sterilise the entire alpha/beta quadrants.'
In 'RBoE', Spock's unification movement receives a major boost - now it's able to expand in the open.
Also in RBoE, Spock directly says that one of the ways he envisions vulcan-romulan reunification is the vulcans leaving the federation and uniting with the romulans- and he has no problem with such an outcome.
You are, again, over-stating your case. You are, after all, talking about the eminently logical Mister Spock, who can speak in perfect serenity about his own imminent death when discussing a given situation's potential outcomes. Spock, being the frank person that he is, simply answers the question of how Vulcan and Romulus might reunite by listing a number of possible scenarios. That he includes a one scenario -- that one of the ways in which Vulcan might reunite with Romulus is through secession from the Federation -- in such a way indicates anything about what he actually advocates about the future of Vulcan's status within the Federation.
There was nothing theoretical about Spock's words in RBoE.
Spock put his actions behind his words. For decades, all he's done is be on Romulus, tirelessly trying to advance the reunification cause, instead of advancing federation interests elsewhere.
All this BEFORE the borg turned half of Vulcan into a radioactive desert.
In RBoE, Spock specifically said the vulcan-romulan reunification he worked so hard for was quite likely to be achieved by vulcan seceding from the federation - that's what he worked so hard for.
And this is Spock, who has a high opinion of humans.
Many vulcans think a lot less of emotional species. Examples - T'Pel, DS9:'Take me out to the holosuite' vulcans, etc.
My case is more than supported by the available evidence, Sci.