Smartphones may lose in a lot of fields against A9, they do not lose entirely. The point is they use more sensors and newest computing, they got fast upgrades and mostly some even 1/30 of price for new tech.
As a photographer I miss my 6" screen a lot, using different angles in tight spaces its just impossible to also see and to see focus. Body with apsc is still ok but most of dslr size is just like boulder.
What smartphones miss in size, computing and battery, they get back with usability, better and upgraded hw and battery friendly usage. They may not win for now but at this speed and users support, it may not be long.
Example - shooting milky way in hand, shooting whatever whenever(because its easy to carry), ultimately simple to use UI.