It isn't clear whether the OP is referring to hand flying down to a CAT1 MDA in decent weather (good practice and well worth it) or doing the same when the weather is actually at the limit (not a good idea if other options are available which they almost always are) but I suspect the former.
Our ops manual states that the autopilot, and a precision approach aid if available, should be used if you won't be visual by 1000ft above MDA.