when the cam bolt is tight the crush keeps it from moving not the tab, you can fab a new one weld it all up if you want, personally I wouldn't wast my time on it.
You obviously haven't tried to set the alignment on a car without tabs. No, the tabs aren't structural in the suspension, I already said that, but setting the alignment without them is a painful and annoying process.
Exactly. And I wouldn't want to weld the eccentrics in place and use adjustable control arms. It would work, but that's completely shade tree. If you can weld you can fix it right. I'd be PISSED if I found the eccentrics welded to the mounts on a car I was trying to align, even if it could be adjusted with the UCA. Just the lazy, shortcut way to do it.
