It seems the coreutils port exists mostly to assist with
gnu-behaviour sensitive build environments to grease the wheels
for various complicated ports during build

Secondly, it seems there is little or no priority to make the
coreutils good for users to use interactively on a regular basis,
instead uses should lean towards using the consistant openbsd
utilities at the standard paths.

So:

The build environment aspects of coreutils -> important

users using coreutils directly -> irrelevant; no serious maintainance effort 

I suspect the build environment aspect depends upon maximum stability
provided by the slow-changing coreutils, because any behaviour change
will make the ports developers waste time.

ports team, do I have it right?

If that's the situation, then any proposal to replace them is a complete
non-starter and there's reason you aren't taken seriously.

It looks like a few people have nicely told you to stop, so please do
that.