> "Only cladistically" is a bit like saying "only in reality" imo.

In the sense that "imo" means "in my opinion, not necessarily in reality".

Clades are just a view on biology. It's not the only one. Otherwise, very few things in biology would exist.

> Well.. eel-like probably more I'd guess.

Still a fish.

The only people who want to see fish cladistically are the ones who don't want fish to be a thing. Fish are obviously a thing, and they are obviously not a clade. It describes function: water, gills, spine.

> eels are not fish

Many disagree.