Presumably, you can be denied a mortgage loan if your score is too low. People will be unhappy as a result and our elected officials will find a new cause to protect us from. Fair, Isaac and the credit bureaus do not want to reveal how these scores are computed. The amount of credit data history is so large that there are problems with it. The most common problem that I see is with relatives with the same name.
Borrowers often dispute the data but it is very accurate.
It will become more important that ever to keep a good or perfect credit history. The downpayment must be well-documented. That is, you must show, for example, bank statements proving that you have had the money for at least 2 months. The purpose of all this is to make sure that the downpayment is not a loan and most especially not coming from the seller. Any inflationary news translates into smaller values for fixed-rate securities and necessitates a rise in mortgage interest rates.