I can verify C100drivers comments. I have asked the most senior people on the 737 program and they are as per the FCTM quote, ie A/T off for landing when the A/P is disconnected.
The reason is that unexpected/unnoticed A/T activity may destabilise the landing leading to a tailstrike or worse. If your airline still permits the use of A/T at arm and has an incident you may be on thin ice legally.
S&L