From the linked article in post 2:
When Fender introduced the “bullet” truss rod system in 1971 on the Stratocaster, the truss rod adjustment mechanism moved from the body end of the neck to the headstock. This design entailed routing the truss rod channel into the back of the neck (as in the 1950s) regardless of fingerboard material, which meant that all “bullet” Stratocasters—maple- and rosewood-fingerboard models alike—were given skunk stripes. When other Fender models subsequently received bullet truss rod systems in the early 1970s, they too were given skunk stripes.
Finally, near the end of the 1970s, all Fender electric instruments, regardless of fingerboard material, were given rear-installed truss rod systems with skunk stripes.
They’ve been back to stay ever since. Today, skunk-stripe necks are pretty much the norm on Fender instruments, except for authentic recreations of older instruments that didn’t have skunk stripes in the first place (such as American Vintage series 1960s models), other models that include vintage features but aren’t necessarily strictly vintage-style instruments (such as some Classic Player models), and several other instruments (such as various American Deluxe and American Special models).