I don't think there is a cutoff point in company size or whatever above which writing suddenly needs to become sterile. What you have is actually more a cultural thing I think. People thinking that a "professional" message is needed, when straightforwardness would be a superior goal. (On the other hand, a good reason to aim for "professional" is that everything released by a company has a consistent voice/tone.)

Notice that Musk runs his companies the same way - by trusting what's really important vs what isn't. And anyone who has invested in Tesla is already familiar with his irreverent character. (See this[1] interview for example).

[1] https://www.youtube.com/watch?v=ajP3B0gYJlo

And, you can always short the stock...