Before Trisquel I used Debian. Despite the software being a little old, it
worked well for me.
I think that for non-technical users it would probably be fine to use (as
long as they have someone to install and do upgrades - like most Windows
users). I know people who happily use old software (sadly proprietary) like
IE7 and Office 2007. Many people don't care about the latest and greatest -
they use what came with their PC because it works.
I've noticed that some technical people get excited by the latest features in
Firefox or LibreOffice, so using old software isn't an option. And there's
nothing wrong with that either. That way the new software gets tested as
well. :)
Maybe people will disagree with me, but that's been my observation anyway.