Bovine scatology - wow, had to look that one up.

Is it just a simple change the date in the software?  What items are affected by a due date change: Underpayment penalties? Direct Debits? The Letter? 43 States? Where you're missing the boat is that all the software companies are dealing with 1040's, 1041's, 1120's, and more as well as the states for all of these.  Every time there is a law change in any jurisdiction they have to make sure their update doesn't screw up something else. Just look at my post last week that Microsoft's Windows 10 Update screwed up millions of computers from both printing and the blue screen of death. It affected my office.

Yes, we're in the business of customer service.  Yes, we're at the mercy of our software companies. But I'd rather wait and get it right versus explaining to a client - oops, we have to amend and you owe more money because the software update wasn't fully checked.  Just my 39 years of experience talking here.