Why is the structure known as a Planetary Nebula historically misnamed?

It resembles a planet in early telescopic observations

The expanding shell of gas and dust ejected by a dying intermediate-mass star is formally termed a planetary nebula. This name is considered a historical misnomer because these beautiful structures have absolutely no physical relationship to planets or planetary systems. The designation originated from the earliest telescopic observations conducted by astronomers, who noted that through their primitive instruments, these faint, somewhat circular shrouds of gas appeared visually similar to the fuzzy disks seen when viewing actual planets like Uranus. This superficial visual similarity led to the adoption of the name, despite the subsequent realization that they are related to stellar death, not planetary formation.