I did not say that, nor did you suggest it. You asked if overpayment should be blocked.
Because you might want to under some circumstances. Manager’s design philosophy, as expressed by the developer, is not to limit your choices within the confines of standard accounting. Suppose a supplier sends an incorrect invoice offering an early payment discount. You want to take advantage of the discount, so must pay by a certain date, before the supplier has a chance to correct the invoice (perhaps they process invoices every two weeks and the deadline is one week away). The program will not prevent you from paying what you know to be the correct amount.
I am sorry if you have that impression. You have made a number of suggestions in several different threads recently, some of which cannot be implemented. I’ve done my best to explain why. In other cases, I have tried to explain how you can already do what you want. That is what I am asked to do as a moderator.