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I’m not sure I exactly understand your question on the importance of “on axis pivot of a spherical rod end” as opposed to "poly ends”, but if you look at Art’s web page, there is a section that explains which one you should use for different applications. The bottom line is that if the joint has to move other than radial about its axis, the normal poly end joint will not work. That is the situation when replacing the spring plate, you have to use a spherical joint end (or a heim joint). Unless, you don’t care about putting a strain on the suspension and likely having something break. The spring plate is able to twist, if you replace it with a non-spring plate either it or the joint will have to also twist, or break. I don’t think chassis vibration is a consideration. Otherwise, I generally agree with your comments.
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