Removing it instantly doesn't bring too much to the table. Sure it gives a slight amount of convenience, but that same amount of convenience would be risk too. A hacker with a script could crack it quite easily, there are only 10000 different available pin codes, not that these are common in use, but these would be a lot more effective if the instant removal was a thing.
It's intended purpose may be for changing the bank pin, but someone trying to get items out of your account would have an easier time putting a pin on it and slowing you down in getting your stuff back. Just deal with the fact that you have to wait 10 days, stop being impatient.
It doesn't do much for safety, I disagree. I don't see any reason why you would want to remove one anyways.