I used to get paid in stock. I had a plan on file to auto-sell it every month, and then I reinvested the proceeds so I had less financial exposure to my employer. The exact scenario is if the company stops doing well, then your job is going to go away at the same time the stock becomes worth $0.
The other side of the coin is that you pay significantly less taxes if you hold on to the vested shares. They increase in value after vesting, and you structure your sales such that you take a long term capital gain. A lot of my coworkers did that, and have a lot more money than me. But it's a gamble, and you should always weigh your gambles by how badly you can afford to do.
(I hate getting paid in stock, but it's advantageous to the employer, so it will always be a thing. With auto-sale, it's a very similar risk to being paid in cash, except that you have a lot of annoying paperwork to do every year. But you just pay someone to do that.
Oh, and if you're a new FAANG hire, please just find a professional to do your taxes. I did it myself and fucked it up a number of times. The IRS does not like fuckups, and extremely competent professionals will do everything for you for a small amount of money.)