A $1 million loan on a 30 year term at 3% interest ($4200/mo) is totally different from say 5% (5300/mo) or 8% (7300/mo) interest.
It’s strange to me that the principal of the loan is the basis for the policy rather than the monthly payments. If interest rates hit a 30 year high to match our 30 year high in inflation, the share of Americans who can afford a million dollar loan will be a tiny tiny fraction of what it is now.