I don't see the 2 exec leaving as that big of a deal.
Sounds like the Production VP Greg Reichow left because he was burnt out from the MX roll out. At least he waited till the MX production is "flawless" now to announce his departure. Tesla and Elon also had good things to say about him, which makes sense because they want him to stay around to hand off to the next guy.
in contrast, the manufacturing VP Josh Ensign just left. I haven't seen any positive comments from Tesla about that guy. Maybe that guy was responsible for the delay in MX production, if that were indeed the case, then I say good riddance.
Remember the China sales debacle? Elon fired a bunch of execs, and started turning it around. Traditional companies like stability, and C*O's are like a closed club, only those with "in" are allowed, and given cushy jobs for life. At Tesla, it seems that everything moves fast, both technology wise and also personnel wise, if something doesn't work, it gets changed, right away.