My Ubuntu for mobile devices post mortem analysis

Now that Ubuntu phones and tablets are gone, I would like to offer my thoughts on why I personally think the project failed and what one may learn from it.To recapitulate my involvement in the project: I had been using Ubuntu Touch on a Nexus 7 on an on-and-off-basis between its announcement in 2013 and December 2014, started working on Click apps in December 2014, started writing the 15-part iHacking Ubuntu Touchi blog post series about system internals in January 2015, became an Ubuntu Phone Insider, got a Meizu MX4 from Canonical, organized and sponsored the UbuContest app development contest, worked on bug reports and apps until about April 2016, and then sold off/converted all my remaining devices in mid-2016. So I think I can offer some thoughts about the project, its challenges and where we could have done better.Excellent and detailed explanation of why Ubuntu Phone failed.