Yip, there will always be different ways of doing it.
Indeed, in the 15 years i was on the 737 i had to fly every CAT I approach dual channel if i still used the autoflight system at that point (manual raw data approaches were encouraged and very often flown). We knew we could do it single channel in case that one AP was u/s, but SOP in the airlines i flew was always use dual channel.
Now, from what i have read in this thread it is different at flydubai and they only use one AP during CAT I approaches, which of course leaves an automatic go around out of the question, but if above 400ft AGL it is simple enough to just re-engage the autopilot right away if one wishes to do so.