I think the entire blog post is meant to address that question. It is trying to differentiate from the cheap Android phones. For me this is the most interesting point:
> Devices shouldn’t become outdated every year. They should evolve with you.
Also the design looks much nicer than average cheap Android phones.
Which is basically what any other Android phone manufacturer would offer for their flagship phones, except for the fact that they don't guarantee it. Samsung, HTC, Sony, Google, even LG, all have similar track records with the margin of error within half a year or so.
Make me a $200 phone with 3 years of updates and I'll be impressed, or an Android flagship with 5 years.
> Devices shouldn’t become outdated every year. They should evolve with you.
Also the design looks much nicer than average cheap Android phones.