Sure, there are a few serious cruisers who have these kinds of
boats, but even they don't overload them with gagets and other
crap.

Wrong again. Most designs for serious cruising are not stripped out. There are
quite a few offshore cruisers at City Island, including boats I mentioned, no
one has a spartan interior.
Swans and Oysters make PLENTY of serious passages. No spartan interior.

RB