>And ... guess what... Bank uses Base (no bonus, no RSUs) to calculate your mortgage.
you have obviously never taken a mortgage in US. What bank typically uses is 2 last W-2s. In case if you don't know what W-2 is - it includes base + bonus + FMV of the vested RSUs as of the vest date.
And ... guess what... Bank uses Base (no bonus, no RSUs) to calculate your mortgage.