TT discourages it because the IRS doesn't want 2022 estimates before the 4th quarter 2021 estimates are paid ... it is too easy for the user to send the wrong form by accident or to have the wrong tax year credited.
According to the charts the 1040-ES are due out 2/17 and the 4868 on 2/3 :
https://ttlc.intuit.com/community/forms/help/irs-forms-availability-table-for-turbotax-individual-pe...
