Direct mining motherboards with no risers are the best, they are very close to how you will plug a Asic miner and never look back, I only do updates on hive OS with riserless motherboard, no reboots or downtime.
yeah my 14 cases from minerdude are close to perfect up time.
this is very important to me as the trip is 140 miles or 200 kilometers round trip.
I use smos and have had really good success with them.
I use a riser here and there in my house on small rigs.
they are not as stable as the 12 12 cards slot rigs or the 2 8 slot rigs.
I do not rule out riser rigs but I don’t use them very much.
Still i can see use for a riser here or there but not for me and the close to 200 cards I have.