The primary reason that intuit did not support Windows 10 is the testing cost. The application is very unlikely to be using windows 11 specific functionality like AI functions or Windows 11 user interface elements. It is always a tradeoff on whether to support an older platform or not, and somewhere in management the decision was made to cut older operating systems, probably a bit prematurely. I've had to make or support these decisions in the past professionally, and its never easy to alienate a group of customers. They probably set out believing the upgrade curve would go as optimistically as microsoft promoted, and then got caught too late when it turned out to still have a heavy windows 10 contingent in their userbase.
I always run my tax software in a virtual machine I can archive away so I can restore that environment in the future, if needed. It will be a pain to set up a win11 vm, I'll have to weigh that vs going with a different vendor for desktop tax prep.
