The wingspan aspect of 8260.52 has been questioned by not a few folks
The wingspan has been used, creatively, to create procedures for the 737 capabilities, without the limitations of other aircraft designated as Class C. The 136 leaves out the 757 as an example.
That class designation, with final approach speed of 140kts, no longer has any basis in reality.
Also, with some of the Class C aircraft such as the 757, having bank angle limits of 25 degrees, thus the 18 degree FAA limit, this severely restricts the 737 which can bank limit to 30.