Most US hams use a "magic formula" to give the wavelength in feet, when they are building antennas, so aren't all that familiar with 300/f where f is MHz, & wavelength in metres, let alone the full version.

The oldtimers knew the real formula, but the "number crunching" was harder to do in your head, so the antenna formula, "half wavelength in feet = 468/f, which you will see in the ARRL publications, & echoed across the Internet was derived.

This includes correction for "end effect", shifting the person using the formula one step further away from the original.

With the proliferation of calculators, both real & "Apps", there is no longer any reason for this "crutch",

but it has become part of the fabric of ham antenna building.

The silly thing is, when you see an Australian ham, born years after metrication in this country, using 468/f, then converting the answer to metres.