The purpose of the estimates is to ensure that parliamentarians have a line of sight on what is being put before them for voting as it pertains to the appropriations for the various votes of the departments. There is funding that is approved through appropriation acts, through the estimates, and there is a spending authority that is approved separately through statutory legislation. EI and the Canada child benefit are items that are supported under separate statutory legislation and that receive their payment authority through separate statutory legislation that is not linked directly to a department.
On May 12th, 2021. See this statement in context.