I understand, but that's not the point. TT doesn't support it now while a competitor does. No one is going to hold onto their computer forever, but pissing off ...
All you can do is vote with your wallet. Companies can deal with the loss of revenue and address it, or continue on. Personally I don't think TT gives a rip if ...
There's another option to upgrade unsupported Macs to Catalina, which will allow you to run TurboTax. I upgraded my 2010 MacBook Pro this way and it is running ...