Reinforced lower control arms vs. upgraded/tubular lower control arms?

The links themselves is where I've seen breakage, not the tabs. When I write "brackets" I'm refering to the bar-mounting brackets on the K-frames. This is on the early style ones that are attached to the front weld flange. A third attaching bolt or welding those makes a big difference.\

I basically agree with you on any slop on the LCA bushings, and thats where all the forces are; vertical loads, a portion of for-aft from braking, and yes any twisting from the leverage applied to the sway bar tab.