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FWIW, Nest products were never very open. I had one pre-Google acquisition, and there was never a way to talk to it that wasn't via Nest's own servers, even though it's on my network.

Of course, the likely thing is that Google will not go out of their way to make it possible to make Nest plugins for Alexa, Cortana, etc.

My only concern with this move is that Nest products might become less open as a result.

Will they become better tested, or will it work the other way?

I guess that largely depends on your opinion of their current level of testing and Google's level of testing for their other hardware. Presently Nest utilizes the Centercode platform to manage a pool of beta testers.

You can certainly guarantee you'll never have Alexa assistant inside the nest (like echobee for example)