Cool
Just one story is enough to turn me off relying 100% on software volume control. And I've heard a few from Roon users, not only with LS50W's but guys going direct from DAC to power amps.
I'm not concerned with the loss of resolution (there is none in practical terms) of digital volume control but I am concerned about a Roon bug showing up one day (as others have experienced - I know you haven't personally) and blasting full volume at my headphones.
It's not superfluous for those that had full volume blasting
I know you mentioned you never had this but unfortunately others have. That's just a reality.
Avoiding this is a very nice reason to go for something like the new Topping D50s with remote volume control.
Plus the new D50s has no ESS IMD 'hump' either. Will make a nice pairing with this headamp, with it's built-in digital volume control