RVDT - I think you’re right, fundamentally similar cause to Sumburgh. Losing awareness of maintenance of particularly a satisfactory airspeed and descent rate on an approach in IMC (or pretty much) conditions. In both cases the situation deteriorated far too far, leaving late recovery too big a challenge for the crew. Comes back to basic IMC flight techniques - continual monitoring with the instrument scan is vital, to nip deviations in the bud. Whether hand flying or using any AFCS modes.