Using the example above, you get $25,000 in stock every 3 months. So the number of shares are variable, so the price is irrelevant to you. If you sell as soon as you get it, it's the same as $25k cash, e.g. completely divorced from the stock price.

If it was tied to the stock price, like every other RSU program on the planet, you'd get x number of shares. So as stock price goes up, your compensation goes up. Your compensation is tied to the stock price.

No. Your total compensation is fixed. You're deciding how much of it goes to stock (as opposed to your _grant size_ being fixed).