Can you name an instance where a "Monster cable" IS needed?

As I said earlier, for longer runs low attenuation is more important
and Monster cables are fairly good in this regard, at least they
were last time I checked a few years ago.

It's just wire. There are many MUCH lower cost alternatives.

The same is true with coax cable. You can use RG-59, RG-6 or RG-11,
but if you are running 400' and use RG-59 rather than -11, you'll
likely be an unhappy camper.

Different issue altogether.