Why isn't estimated tax payment voucher 1 printed with required forms when e-filing?

I almost always have estimated tax payments required. If the estimated tax payment work has been done for a return, then [at least] the first federal and/or state payment vouchers should be printed along with the "required forms", but they are not. It's a hassle to have to go back and select a page or two from the 150+ complete pdf file to print the forms.