Then someone needs to change the policy in this case for "non supported versions" as all that use and paid good money for previous versions were happily managing our companies using 2019 and forward versions, but Intuit decided not to tell us that our product would crash if we upgraded to Sonoma. If you were aware, you should have informed.  If you were aware and did not inform then the issues we are having rest with Intuit.  

It is good business to take care of your customers. When a mistake has been made, Intuit should rectify it.  I would hope your "customer" VP would take a hard look at this issue regarding patching 2019 and forward for Sonoma. Sunsetting a four year old app and not informing them that it will crash when they upgrade is not caring for your customers.  Not informing your customers that your product is not ready for prime time running under a new OS should not be an acceptable business practice for a company that drives so many businesses.  Leaving your paid customers with legacy product high and dry without giving them notice of compatibility issues is just not good business.  Allocating the resources to fix this issue for 2019 and forward should be a common sense progression after this experience.  Worst case you should charge a small amount for a patch or offer a deeply discounted upgrade path to a newer compatible version to make things usable with Sonoma.  FWIW, my two pennies.