Im working for one one of those companies that still use the ARM feature as SOP. We have been using it now for over 20 years on both the classic and the NG and so far it has never caused any landing problems. It can be a nuisance in approaches during gusty weather, most of my colleagues click it off in manual flight then. Guess most of us have read the turkish airlines incident and one thing often pointed out as the main reason was the AT behaviour with less than 27ft RA indication: going into retard mode, not shoving in more thrust to maintain speed. Wonder therefore how those long landings really developed. Flare at 50ft? Anyway, good training remains one of the major issue, no matter which SOPs are used.