Why does Intuit not support e-file for the same two year period that the IRS supports?

I am using a paid version of TurboTax, but Intuit as an e-file provider chooses to only support e-file for 6 months (October 15)after after the tax year the return is due rather than the 2 years the IRS supports for e-filing if it's within two years from the original due date of the return. Why does Intuit not support what the IRS supports?

One of the primary reasons why I choose to pay for software tax preparation is so that I may electronically file for the same obvious reasons and benefits inherent for those doing so by October 15?

Please do not half ass the response, I've been a paying customer for over 20 years and believe an honest question warrants an accurate and reasoned response. Please respond to email@donrileyjr.com and thank you for your response