IMHO, aluminum ejector rod housing doesn't make sense. Different part from rest of revolvers in production, with additional cost to manufacture, stock and assembly. Saving on weight insignificant. On top of that, if surface finish gets damaged, almost impossible to fix it, unless you go to specialized shop for anodizing.
Contrary to blue Bisley, all stainless ones have steel ejector rod housing, and I never heard anybody complained about that.
Yeah, talking about non-fluted cylinder, I had 357 and 41 Bisley, have now 44, and when compared with SBH 5.5" SS and its fluted cylinder, I am for fluted cylinder on any revolver. BTW, that SBH 5.5" SS is now Bisley: