While the IRS form 1040X is available, since it doesn't really change from year to year, even the IRS would strongly caution you against amending a return this early in the tax year.
The 2020 programs and even some of the IRS forms aren't even fully complete yet for all taxpayers. Congress in the process of passing laws as I type that will change everything up yet again for THIS tax year.
Programmers have to focus on things in an order of importance - and most important is helping customers get their first return filed first. It's likely your impatience that created the need to amend in the first place.
Trying to amend a return right now, with more changes set to come, is pretty much a recipe for disaster. What if one of the next changes affects you and you have to amend again? Having more than one amendment out to be processed at the same time is begging for trouble.
TurboTax has historically always had 1040X ready mid-March and this year the projected ready date is March 18. It won't happen any faster because you think it's "ridiculous" that they finish the current year's product first.
I won't be surprised given that the bill with retroactive tax provisions is due out this week to see it pushed back in favor of programming to address those changes being prioritized.
