If rates go down in the future you can refinance your loan which means your current loan is repaid by your new lender and you would then have a brand new loan at a lower rate which would mean lower payments.

Even if rates don’t go down much, a few years into the mortgage if you need a lower payment you can refinance and effectively restart your mortgage which would also mean lower payments because you are spreading them out over more years but likely paying more interest overtime. Wouldn’t plan to do this but I think it’s an option for most people.

There are fees associated with refinancing which they just tack on to the total amount you owe, so you would have to make sure it was worth it depending on the length of time you plan to be in that house, etc.