To clarify I’m not sure it counts directly to income, but it starts to be taken into account when there is substantial salary and other investment funds, especially if you are right on the border of the salary/loan ratio. Someone else mentioned it’s more like collateral
Probably depends on the broker and market. We bought in the bay area and RSU were counted as income (and fairly certain 1:1 by some lenders). And in some other areas they wont look at them at all is my understanding.