Expanding on that second one, if the most reliable way to get promoted is to create something of value to the company, that's a very good sign. If the main way to get promoted is for your boss to like you or owe you a favor, run away.
(I don't see any of this as a problem, BTW, but I think it's worth pointing out.)
Selling all your stock comp immediately is more about diversification of risk.
If rsus are a nontrivial aspect of your comp, then you're already extremely exposed to risk in your company's stock price stock price (if it tanks take a big pay cut and they might even lose their job).
So, rather than gamble, I did what I felt was prudent and sold all my stock. I've got plenty tied up in the well-being of the company already, from my unvested stock to my future career trajectory. Even the value of the real estate I own could rise or fall with the fortunes of my employer. I don't need my fate any more tied to or correlated with the company than it already is.
Nope.
Large companies are like communism, even when there are opportunities for internal competition, it is stamped out. And for all the talk of "market pay" and "executive rentention bonuses", there is little in the way of incentivizing employees with revenue sharing tied to what they produce.
Which underlines the entrenched oligarchy of the USA. Like a meta-conway's law, our government is just a reflection of large corporations in the age of cartel/monopoly/consolidation in virtually all sectors.
Digging holes and filling them back up might not help humanity progress, but it probably doesn't have much stress either.