I think most shift to the turned shoulder plane or the squared shoulder plane, either with a single from elbow upward to the 'shoulders' or even double returning back to elbow. How the hands are set at address will help your chosen swing plane, too.
I often hear that Watson "single planed" on one of the shoulder planes but watch the vids (although time changes people swings), he started on elbow and single shifted (quickly) to the shoulder, turned , I think.
Don't get trapped into thinking a shift is no-no. If it feels right, do it.
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