I'm amazed at how many people that get a significant portion of their comp as RSUs hang on to their shares after vesting.
During this insane bull market it's happened to work out, but having your income and a major portion (for most tech workers) of your assets perfectly correlated is absolutely a bad investment idea, not to mention the fact that you can only trade during approved windows and are not allowed to do any hedging (such as buying protective puts).
Even if you're wildly bullish on your company, at the very least diversify a bit with highly correlated stocks (for example if you're a GOOG during the last decade at least split it up among other FAANG). This way you can at least protect yourself in the event that your particular company gets hit hard.
It's incredible how far away the dotcom burst is in people's minds (or even 2008). Cheap money has led to an insane period of growth in tech, but investing as though that were the norm is very risky (without even optimizing your reward for that risk).