[Klaus]

While I quite like the new Sigma FP from a concept perspective, I'm wondering where the industry is heading in terms of product usability.

In the DSLR world, basically all cameras converged around the same design principals - a grip, a front- and a rear-dial to control things and navigation buttons/joystick for navigating through the camera menu.
If you know one DSLR, you know them all - roughly speaking. Cameras that didn't follow the basics vanished into history. 

Not so in the mirrorless segment. As you know, this is clearly the place to be for me personally. However, I have to say that there are quite some freak products out there.

* why is a 'historic' layout with a EV compensation dial on the top a good thing? (many Fuji, Sony) There is a reason why this was abandoned on DSLRs in the early 90s. It's nice looking but it is just cumbersome in real life IMHO. 
* what happened to a reasonable grip? (Sigma, many Fujis/Pana/Oly)  Given the overall size with the lens, a grip doesn't add any really bulk in your bag.
* Whenever I touch a Sony A7xxx I wonder what Sony thought when they designed all these hard edges. It's just uncomfortable to hold. What happened to rounded designs? Bauhaus may be good for buildings but cameras?
* Is a (tiny) touch screen really a good thing on a system camera - at all?

I, for one, like to have a camera that is comfortable to hold and where it is possible to adjust settings with my hands not leaving the default positions while being able to keep looking through the viewfinder. Is that asking too much really?

Or am I just an old sack unwilling to accept the better new ways?

PS: In my book, the EOS R and Pana G9/G95 (probably also the Nikon Zs) are good designs but ... well ... these follow DSLR guidelines.