Many frame plates have been worn, but many more swingarms have been damaged or destroyed in attempts to remove frozen swingarm bolts (they're actually not spindles, per se) and stuck metalastic bushes.
I have yet to be convinced of the "benefits" of introducing any amount of other-than-true movement into a swingarm/rear wheel assembly (same goes for Commandos).
Rose joint top and front steadies, and several different forms of "haunch" (3rd point) steadies improve the handling noticeably on a Commando; featherbed frames benefit similarly from sintered bronze retrofits (needle bearing kits are said to be inappropriate for the application).