This may be a little cynical but: "With our culture of bringing our whole selves to work and seeing team as family, with shared values we live by,..." In the American business world, you are an employee until you aren't. Confusing being an employee with being "family" is a mistake, both for the company and the employee. When times get bad, companies do what it takes to survive, including throwing employees overboard.…
In the beginning the rewards from the human elements are far greater than the performance of the company. It could even be all you've got. You could have no profits, be in stealth, just prototyping, etc. Here the company could just be a promise written on a napkin or a handshake between founders. It could dissolve any minute.
Eventually though, once the company grows to the point where it hires people and makes money and pays taxes, the value of the company begins to far outweigh that of any individual member, or of any organic human elements that tends to adjust themselves anyway. This is when the company you founded might turn around and fire you. But congratulations, that's also when you know you've (sort of) made it...
The takeaways is to know your function. So long as you do, you should be able to predict if you belong. And if you know you don't, you should expect to be let off, knowing only that the people running the company are doing their job correctly.