My experience has been that the value of RSUs can be unstable to be considered as a paycheck. My last employer had a price based vesting.
For example, they gave me $10000 RSU vesting over 4 years. Then they used the current share price, say $10 as the fair value. 10000/10 = 1000 RSU vesting over 4 years.
If within those 4 years, share values go down below $10 I have made a loss. Because $9 * 1000 = $9000 worth of shares. And it happened with my last employer.
In such cases, it is no longer a paycheck. Rather a bonus which might or might not pan out.
When I started searching for a job it actually put me at a disadvantage. Whenever I talked with employers who had no RSUs benefit plans they always tried to reduce the value of my total paycheck. The refrain often was "You said $10 but I see only $9. So, you are not getting $10000 shares rather $9000 worth of shares".