Most of my career I just flew the airplane like a pilot and didn't care much if anything engaged or not. If it did fine but if it didn't I wouldn't blame the systems, I would blame me. Yes, sim checks you have to do the cat lll approaches but in real life you seldom or in my case never did. We never should rely on anything to work as advertised because sometimes they don't.
All approaches are quite simple to fly. Never get low unless you are visual with the runway and can procede accordingly. So many accidents and near accidents like SFO are done by pilots that can't fly without their automation. Sometimes automation fails. We need real pilots back in the cockpit like we did in the past.