I think it interferes with the PMT function. Excel can't cope with both.
Actually, I wouldn’t say that was pointless at all, you are testing that a cell contains today’s date and that it is not blank. I can think of several reasons why you would want to test this condition.
As far as im aware that would check to make sure that it was greater or less than todays date and was equal to today
I was asked to make some changes to a spreadsheet today and I found this
=SUM(E5+K5)
even =SUM(E5,K5) is pretty wasteful.