Why speculate? Wait and see.
You mentioned elsewhere in this thread[0] that you're concerned about global warming and "Tesla is, by my measure, the tech company that comes closest to addressing this in any way." Tesla has not yet succeeded in having a significant impact on global warming, much less transformed the automobile industry or the large-scale use of batteries. Whether or not they succeed is something that many are interested in, just as it seems you are. Tesla has very ambitious goals in terms of Model 3 production and many people have expressed doubts whether they'll be able to meet those goals. Missing those goals could have a significant impact on the long-term success of the company. To meet these goals, Tesla acquired the automation company of which Grohmann was the CEO. If the departure of Grohmann results in management difficulties or departures of other Grohmann Automation staff, this could have a significant impact on whether Tesla meets these goals.
A wait-and-see attitude can make sense if you're just interested in the outcome and don't think you have any stake or ability to influence the company or the industry. If that's where you're coming from, there's nothing wrong with that.
At the same time, if you're concerned about the long-term survival of Tesla, own Tesla stock, are perhaps interested in purchasing a Tesla, or interested in getting into the electric automobile industry or battery industry, or any other of a number of reasons, or purely from an interest in better understanding how changes like this can affect a company, or an industry, this can indeed be something that is important.
Sure, there's some gossip-like discussion. We should all do our part to improve the level of discourse. Dismissing or trivializing others' interest, however, is not one of them. Share your point of view? Sure. It can be a worthwhile contribution to get someone's perspective, and in my experience on HN, one that's generally well-received when it's thoughtful and well-considered. Expressing your "wait and see" attitude with respect to Tesla I'm sure is something that people can appreciate on its own, while remembering that there are others that may not share it.