People make mistakes on previous years tax forms and have ethical reasons to correct those errors. Makes sense that if older returns are updated/changed that a completely new import to the subsequent year which requires starting that return from the beginning is cheaper to do than creating the rules based algorithms to insert changes in a the subsequent years return that is already in progress.
What does not make sense is withholding the no-cost old downloads to install purchased software after 3 years have elapsed. Nothing needs to be updated on older state tax forms 3 years later, but without them one cannot make corrections to older returns to benefit getting the correct carry forwards to returns within the 3 year current window. This is a huge problem for TurboTax with an easy technical solution (keep the downloads available) with close to zero cost (no stewardship of new updates needed; just allow the program to update itself as it has for 3 years).
