Tesla is attacking too many different problems at the same time IMO. Just building batteries at scale and low cost is on it's own a huge undertaking. Now add cars, self driving systems, charging network, home battery and solar etc.
It's over valued as a pure car company, but the other lines could also be huge companies on their own.
I only ask, because honestly, I bought ( ordered and customized online really ) a new 2015 GMC Canyon and I love this truck like I've never loved another vehicle in my lifetime... and literally NOTHING has gone wrong with it, not even a loose screw... or burnt-out light bulb...
My Tesla has not been problem-free either, but it hasn't been that bad.
For the end user they both affect the 'feel' of the product - how it behaves on the detail level when in use. "I have a door I have a hard time closing" and "the dynamics feel a bit clumsy" deal with totally different things on the engineering level, but end users (generally) are not buying engineering but holistic products.
Namely, concerning this comment: Are there compromises made on the design of the handling to facilitate the build quality? And if there are, then those are not two different things, but systems which interact - hence, it's relevant to offer commentary on one while discussing the other.
Maybe I'm being overly simplistic here but I'd say if the finished product doesn't match the design then it's a build quality issue, whereas if it does match the design and it's still crap then that's a design issue.
Arguably if they end product doesn't match the design because the design isn't feasible to manufacture then that would also be a design issue.
Ford doesn't compete with Land Rover, Mercedes and BMWs but deliver a good value-for-money nonetheless. Compare that to a Cadillac Escalade from GM: Worse quality than a Ford, priced at Mercedes level.
We took a road trip from Poughkeepsie to Niagra in a rented Ford Focus. It had a USB charge port in the center console that came out when we went to unplug the cable. This got me prodding about at the rest of the interior and most of it was too easily removable with my bare hands. It was scary to think who the whole passenger compartment might just explode in your lap with an accident.
I know many parts of the car are held together with retention clips and other tool-less mechanical fasteners but this Ford was exceptional. I don't know if it was down too the poor materials quality or the shoddy engineering of the fasteners but everything could be pulled apart with astonishingly little effort.