Plenty have confirmed that you can do the job without, but not removing the subframe is cutting corners. Period. You simply can't employ the same degree of cleanliness and attention to detail with it dangling. Mistakes can be made more easily (as evidenced in my last post).
We also power wash the subframe and suspension assembly during the service. Having everything clean adds to the quality of the job. But, fewer and fewer people care about quality these days as the value and ownership demographic of these cars fall.
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