> False promises, late releases, poor support, general lack of transparency.
These aren't a problem at the low end; at the low end, you sell someone a phone for $100, and they get what they get, and you're done.
Where you can differentiate on the low end, as an Android founder, is building something where you put out a new phone every year, but everything is on the same / close enough to the same / software platform, so your quarterly (or whenever) software updates apply equally to all your devices. Get about $20-$50 spendier each phone you make, and by the time you're at the high end, you've earned a reputation for quality phones with frequent software upgrades, and people will pay the premium for your phones.
OTOH, premium phones on firesale clearance works pretty well for me. Fire phone, Nextbit Robin, etc.