If you receive stock from your employer and it does not do well, that will probably harm your salary/job as well and you'll lose twice.
If instead you receive the cash value of the stock and invest elsewhere and your employer's stock tanks, taking your salary/job with it, your investiment elsewhere won't be affected.
I wouldn't want to be getting RSU's at IBM for instance :)
But you should be looking at RSUs as a funny money kind of thing.
I think RSUs are more valuable to companies, which is why they do things this way. And that's fine. But it doesn't mean they are more valuable to me.
Of course nobody would actually do that with the cash, because most other things (like buying an index fund or stock in one or more competitor companies) would be a smarter thing to do with it.
Be careful with this... if we're talking about diversifying your risk, there's a good chance that the stock values of your employer and of its competition in the same industry are positively correlated modulo some market events. Better to buy stock that is likely to be independent of the industry that derives your primary salary.
You can play all those games with stock just by using cash given to you to buy stock.
2018 price. 1170$, say 10 shares so 11700$
Right now its worth once you get it lets say 3260$ a share.
So you got over 300 percent return. If you are saying "just give me the 11k in cash and let me buy my own stocks. Well they could, you'd get probably taxed more for that though. (depending on how you handled it, where you lived, et cetra)
That tax difference when you are talking 100ks of stock is entire lower class people salaries for a year.
You can also play some interesting financial games with that much stock. You can put up 100k as collateral for a loan that will have very compelling interesting rates if its a stock that is seen positively and low risk like Amazon stock. And the tax that money is handled tax wise is also interesting.