[Klaus]

... why can my smartphone do that and my system camera can't?

It was taken near darkness. The phone (Pixel 2 XL) took a series of photos and combined them to a single one using some smart algorithm.

[MatjazO]

It will come there, IMO, just will take time. Processing power and software R&D resources are vastly bigger at mobile devices companies, I reckon.
Looking from this angle, could it be the reason why Sony is so succesful with AF development?

[toni-a]

It's a software thing, some P&S cameras already have it, like my fuji XP90
Obviously if Fuji can have it on P&S camera why none of their more advanced options have it , a logic reason is image quality it is good enough for smartphones, but not for mirrorless cameras.
Just my thoughts, some cameras already on the market who allow third party apps might be the first to get it

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UPDATE: YES IT CAN, at least my Sony A6000 can do it
but using a extra APP, it wasn't included in the standard firmware maybe to avoid some negative reviews because of image quality issues, however it is available as a playmemories APP
https://www.playmemoriescameraapps.com/portal/usbdetail.php?eid=IS9104-NPIA09014_00-000002
quite interesting, didn't known about it, I am even considering purchasing this app

[obican]

Pretty sure some Sony mirrorless cameras can do this with no app, my old Nex 5 could.

[toni-a]

Pretty sure some Sony mirrorless cameras can do this with no app, my old Nex 5 could.

It's a firmware thing, it's up to Sony to include it in firmware or add it as separate APP