E.g. "all red wine tastes the same to me, but differently branded 12AX7 vacuum tubes sound totally different".
"These three Lisp dialects are totally different languages, but everything else is an amorphous Blub."
The most obvious examples of operational lumper/splitter problems occur in geopolitics. I'm something of an operational lumper myself, and would love to have been born in a time when one could claim to be a world citizen. Not gonna happen anytime soon, though.
However, it appears that I'm an analytical splitter.
Maybe that makes me a superlumper.
Of no use to the revolution. :)