Did you ever use a WP device (especially before 8.1) - FirefoxOS or Ubuntu - non of them cares about holes in the usability or the lack basic functionality.
By the way what is basic functionality? My girlfriend was happy for years with her N8 and now she is with my old Lumia - she doesn't miss anything because she doesn't even know it could be there. And that is how most users behave - the are using their device between 2 and 4 years as it is - without ever thinking about what could be if their phone could do this or that ... Most of them are happy if there is an app for what's app, Facebook a browser a mail client and a few games - ah and (in case of my girlfriend) a few nice themes ;-)

Back to Jolla, I'm using my Jolla as my daily driver - the workflow is good (beats android from my point of view) only things missing for me are copy text from emails (without workaround) and paste phone numbers in the dialer (that's really annoying as I get many phone numbers (I only need once or twice) per mail and don't want to add them to contacts ...

But all in all +1 for marketability