Yeah, I should have said that another way... If your product isn't ready for a rock star demonstration, don't do demonstrations. First Impressions.
So compare the Arturia's willingness to do demonstrations with a product that isn't ready (or perhaps its the demonstrator who isn't ready, but regardless, my point is the same) versus DSI's choosing to wait until they have the product they want to demo ready for the first impression they want to create.
These types of choices are demonstrative of the mindset in a company that effects everything Design to Marketing to Manufacturing. It's rush to market vs careful product development. And this is why DSI, Moog and Oberheim have always made quality gear.
There are industry rules. One is: Have something to show at Winter NAMM, which is what they did. Plus: they were not as far into the development process as DSI were when they announced the Prophet 12 or the Prophet-6. One can regret that, but that doesn't change anything about the pressure to come up with something at NAMM. It's not that the Prophet-5 was a fully working unit when it was introduced at NAMM in 1978 - it barely made it so to speak. And there are dozens of these examples, especially when a company does something for the first time, and this is the first time, Arturia plan to release a hardware synth of this size.
Oberheim presented the Eurorack SEMs at Winter NAMM 2015 and 2016. Both times with different designs, both times with different outlooks about the prospective module line-up (the first time, it was mentioned that there are going to be four modules, the second time only two modules were announced).
Plus: I'm sure that a company that's developing a synthesizer on the scale of a MatrixBrute will eventually also produce according marketing materials once it's release date is set. It's also not that they made a secret out of not being fully done yet.
As for the quality: No one can assume anything yet with regard to the MatrixBrute. All I've heard from the few people who actually saw one in person is that the build quality appeared to be sturdy. Everything beyond that is pure speculation currently.