Earlier quoted context omitted.
Key bit: right now. What will you do when interest rates change and you end up with an obligation to pay the now much higher monthly amount? If you have your interest locked down for an x period of time and you intend to keep your property always ensure that you can pay off enough of it to be able to continue to live there even if interest rates go back into the 5-10% range.
Most borrowers have 30 year fixed rate mortgages so future changes in interest rates are largely irrelevant to them.
The rate difference is so large that if you are a good earner that it could very well make sense to go for a much shorter fixed rate term. There are many different products ranging from free floating all the way to 30 years, depending on the age of the borrower 30 years fixed might not even be available to them.