Thanks, i am thinking , the straight RC second-stage output filter may offer good enough filtration, and has no problem with any instability like the LC second stage filter.....the problem with LC type is that you never know if the load connected is going to have a big capacitance and take the second stage LC resonance below 3xcrossover.
Also, eg if the load is an inverter, it may actually comprise an L and a C at its input....and this again, as you know, would possibly bring about instability...so if one had added an output RC stage filter (downstream of the output feedback divider), then you at least get some damping of the load's possible LC input stage....and slightly reduce your chance of going unstable.