Thanks for the article - it's a really good read!

Also pretty much summarizes my my findings when researching if porting my apps to Ubuntu Touch would make sense.

And for a short comparison with Sailfish OS - there are IMHO possibly the saving graces why Sailfish OS still exists and Ubuntu Touch doesn't:
- developers being ex-Nokia and actually knowing what they are doing
- sane & nice UI
- not putting the cart before the horse (not doing heavy sandboxing when it's already almost impossible to make a useful app due to missing/broken APIs)
- no reinventing everything, using proven software components
- actual Linux distro underneath with the APIs you expect
- being able to install packages, which makes the system much more powerful & enables OpenRepos (Ubuntu Touch had RO root partition with image based updates - impossible to install packages without also breaking future updates)
- sane application lifecycle - apps are suspended when screen is blanked, but can & do run just fine in background if device is active & can even run when screen is blanked via overrides
- Android emulation (yes, really)