I have a Weaver brass 4-6-0 chassis (with MTH die-cast boiler on top) with sprung drivers and I don't see any advantage. Not sure if my Williams brass 2-8-2 has them or not. IMO not worth the cost or effort of getting it done, if it already comes that way, fine.
I took the Weaver chassis apart, didn't know it was sprung until I did so. I thought I'd have an impossible time getting things back together, but it was not a big deal.