Its better than nothing for sure. It has rod ends on it though? Its basically more of a control arm mount brace so it reduces flex in the cross-car direction but it's likely far less effective for up/down and fore/aft movement due to suspension loads than it would be if it was a square tube in double shear.
Generally all these k-frames seem like they'll parallelogram under loads.
Its quite interesting because the concept (not saying the geometry) of the original pinto front suspensions is a lot better design:
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Cone shaped piece to hold the spring shock with an angle on it for strength, much better. Lower control arm with main pivot in double shear, great. Strut rod with triangulation to locate it, much better. Correct the geometry of the above, tubular or boxed lower control arm and remove the rubber from the strut rod and replace it with a heim like you'd do with a stock mopar front end and it doesn't bother me. The major loads are all inside of the same piece which has a crossmember. Now on our cars, this would have some oil pan clearance issues with mid sump. I would imagine you could do rear sump instead and it works.
I think everyone went away from this triangulated setup generally for being "easy" not because its better.
This is a more modern way to accomplish the same concept (03+ Ford Crown Victoria front suspension). The frame is kinda light on crossmembers but the aluminum piece they have there is very stiff. But you can see the LCA mounts are far apart.
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