Certainly sounds impressive !
Don't give MGR too much agro if they bonded them. To weld them would be difficult without distorting the surround, even slightly, at the weld point which would always be unsightly. That's why the end point bolt thread fittings on the waist trims are bonded I suspect.
Of course you should always use high grade SS fittings then anyway; you could blame MGR for not doing that!
David