One concern that I have is that the Miso CEO (and people like him) will take away the wrong lesson, along the lines of "be careful what you say to employees in email". But the real lesson is that you should keep your promises, and if you have a moment of weakness and try to reneg on a promise, don't be proud: admit the mistake and keep the promise. People make mistakes, even twenty-something CEOs of tech startups (shocking, I know).