You just sell the stock every year and switch it to S&P 500 if you're that worried...
If the value of your invested RSUs go up: fantastic now you make more.
I’d the value of the invested RSUs go down: no problem, you evaluate if you want to wait to see if they go up, or if you want to go into the market and take a new job.
It’s nearly all upside for the employee (in a hot market).
You face the opportunity cost of not working for a company whose stock will rise fast, making it worth much more in years 2-3+ than it was initially priced at.
None of us have a crystal ball though, so it’s all speculation.