Essential? Not even close.
No headphone jack. No SD card. No user replaceable battery. All for HOW much money?
An untried fledgling company so we don't know how well they (won't) maintain security patches, replace damaged units, if any 3rd party accessories may (not) get built (like a hard case to protect one's investment), all at a price point that makes an Apple phone seem palatable?
Good luck with that, I'll be voting with my wallet... & my wallet says "Oh HELL No."