You have a semi-valid point when it comes to a Rowland pistol. They need a compensator and a well 'balanced' recoil spring to make it past a few thousand rounds And they limit the 1911 conversions to only the most hardy frames and slides.
But on the Mech-Tech system THEIR receiver takes 99% of the stress; the lower is merely the magazine housing and the fire control system.
By “well ‘balanced’, above, I meant strong enough to keep the slide from slamming back on recoil, but not so strong that it does damage when the slide comes forward into battery.
“Mech-Tech”
For another $200 you can buy a new CX_4 Storm and keep the sidearm holstered.
But, I guess if you’ve managed to shoot the barrel out of a Glock (nearly impossible), you could use the frame/trigger mechanism and for about $500 have nearly the same thing.