Even with Nikon struggling, I would (and have) choose them over Sony. There are a lot of people frustrated with how they've treated the whole A-mount lens system.
One of the things I love about Nikon is that the lens my dad shot with in 1993 works perfectly well on my camera from 2016. People spend a lot of money on glass (with good reason), and to have the camera manufacturer get wishy-washy on whether or not the line will be supported in the future must be concerning.
E-mount is significantly superior to A-mount for MILC cameras. The extremely short flange length means that it's compatible with pretty much any lens with a suitable adapter.
Your dad's old lens F-mount lens will work perfectly on an E-mount camera, with full AF and aperture control. So will any A-mount or EF-mount lens.
If you're using a Metabones or LA-EA4 adapter on a camera with phase detect AF, there's no practical difference. AF will be slower on a camera that only has contrast-detect AF.
The LA-EA4 doesn't count since it doesn't cover your statement "Your dad's old lens F-mount lens will work perfectly".
Every Metabones review I've seen had slightly slower AF. "Perfectly" still does not apply. Also, not all lenses work with Metabones, i.e., the lenses that don't work with teleconverters because their backs stick out too much.
While I appreciate the benefits you're selling, those adapters aren't perfect.
One of the things I love about Nikon is that the lens my dad shot with in 1993 works perfectly well on my camera from 2016. People spend a lot of money on glass (with good reason), and to have the camera manufacturer get wishy-washy on whether or not the line will be supported in the future must be concerning.