Is it DR's moshul? Leveraging is like skinny dipping in high tide. It's all fun and games until the tide recedes and you're caught without pants.
Or like peeing in one's pants, it's warm and cozy at the beginning, but after a while, it's just wet and stinky.
That being said, none of these are good משלים for leverage. (Though they both are good משלים for tax deferral, IMHO, except if there's a clear tax-free exit path).
Leverage can be a very good thing if used properly. I am not going to argue whether homeownership is good or not, but most people think it is good, and leverage is what allows it for the overwhelming majority of people. Countries with no proper functioning mortgage market don't have a high percentage of homeownership. It also enables upward class mobility.
And while I think there are definitely some good points to DR, if leverage is bad, and paying off a mortgage ASAP is the right thing to do, why is it right to buy a house with a mortgage in the first place?