Interesting. I was asked by a start-up brew pub owner today if I thought his Milkshake NEIPA would work well on nitro. I offered to take a keg home and try it but he didn't bite
I honestly don't know if it would benefit the beer or not. I haven't used lactose in any brew in well over a decade (so I haven't brewed that style) and the one beer I keep on nitro year 'round is an imperial chocolate stout. But this milkshake beer had a character that made me think it'd work. It'd have to be carbonated appropriately though - putting a ~2.4 volume beer through a nitro faucet is a tragic mistake.
I may have to dabble in that style - maybe split off half a batch of an neipa and carry that on as a milkshake and see how it works out. Worst case it goes back in the conditioning fridge for a full CO2 carbonation and then put back on a regular faucet...
Cheers!