I was not working with Martin's buyers, so this IS NOT HIS BUYERS SCENARIO. I'm answering the post by @Danimal
A $2m home with 30% down is about $9,000 per month (PITIHOA) assuming an average 4.5% rate.
Two buyers each with $150kpy incomes, assuming 40% tax burden, brings home about $15,000 net per month. After the mortgage, that leaves $6,000 to spend on utilities, car, car insurance, gas, streaming services, food, etc. It's not a thin margin by any means, but it's not wide enough to give room for error. There may be some RSU or bonus income that comes into play but it can't be relied upon.
If one of two buyers has the rug pulled out from under them, yes it's a pretty risky scenario.
Lenders unfortunately will focus on "Gross Income" for qualifying. It's the Net Income that needs to be the real decision driver. I ask my buyer clients who are just starting to look at their home purchase plans to start "paying" their mortgage now to build financial muscle memory. Example - if rent is $5,000 and Mortgage is $7,000, every time a $5,000 rent check is paid, also put $2,000 in the bank. This does help a buyer get used to the new payment, it builds savings, and demonstrates to an Underwriter that indeed a buyer with tight ratios can make the payment.
My .02c