Re: Not supporting updates?
Once did an emergency purchase of a new cheapo android (existing phone expired) on holiday in UK so from a phone shop.
The phone never received any updates (this was a ZTE, and cannot recall its android version but it was a few behind "current" at the time).
Not an issue for me as when back home ordered a "proper" phone & emergency phone just used for calls & texts to family while on holiday so any security issues would not do much harm.
I'm sure this was not an isolated case, probably lots of "new" stuff in shops that's quite old and been gathering dust and is out of support (or manufacturers CBA to support)