I definitely see where you coming from on changing brands at familiar stores, Reggieshop (they've always had EG Nanimica, Sassafras etc but seem to be stocking a wider range), BiG, now self edge etc I think that's a by product of peak selvedge /workwear passing and with it Japanese brands and quality construction awareness has risen. Hence the proliferation of more modern Japanese/construction method orientated brands in many stores.
Regarding FC, I hoping you wrong as I like a lot of FC stuff after trying them out a couple of years ago. Your right and they are probably trying different directions as the repro brand desire starts to phase out and wish them luck as well as hoping they keep producing what they are good at. I think dropping he arcs/tab completely was a mistake. If they had the desire/demand for no arcs (which I doubt as there's plenty options out there already, but hey we can blame Godspeed for that) I think they should have kept the arcs as an available seperate line.
Also, what's the thoughts/experience on Human Made quality wise? They have a couple of nice ts.