I don't know. People can be very smart and technically proficient and have bad judgement. Essential has made a lot of bad choices, not just with the camera.
But, more importantly, I think that Essential has been clear that they are obsessed with the perfectly flat back being some kind of great design accomplishment, It's one of the features of the phone they mention all the time at promotional events. I really don't care about it and I see a lot of people saying the same thing. It's the screen (and very secondarily the titanium and ceramic materials) that make the Essential Phone stand out. But they seem to really think the flat back is some kind of amazing thing. So my impression is that the desire for a flat back drove the decision to use the dual camera setup, and try to get good low light photography and better detail in general that way, rather than do the obvious thing and use better hardware in the form of a 1/2.3 sensor (like all of the best phone cameras, U11, Pixel, S8).
I also really don't see what Qualcomm gets out of pushing their Clear Sight technology on companies. The benefit is to Sony who gets to sell two sensors, instead of one. But Clear Sight seems to be just another thing that Qualcomm has stuffed into their chipset to attract customers. They don't, as far as I know, get extra money for these things. Their strategy is just to put as much functionality as possible in their chipset (whether or not every phone uses them) to make the chipset more attractive to potential customers.
So, I just don't think it adds up. It is far more plausible that Essential made their own design decisions about the phone and the camera and not that component manufacturers forced them into those decisions.
---------- Post added at 04:19 PM ---------- Previous post was at 04:13 PM ----------
That seems largely if not entirely like a gimmick. They say the special self-healing skin can go up against a "brass brush." Brass is actually fairly soft on the Mohs scale of hardness, about 3. The Gorilla Grass on the front and the ceramic on the back both are resistant to much harder materials than that, before they scratch. About 8 or 9 for the ceramic and 6 or 7, I think, for the glass. I wouldn't be worrying about scratches too much with the Essential Phone. I would worry about the ceramic back shattering, since the harder a material the more brittle it is. And in JerryRighEverything's drop test the screen shattered from a fairly small drop, so the Essential Phone may be more fragile than average in that regard.