There are some war-themed ones, so realistic MMORPGs definitely exist. Sword Art Online however is fictional in the sense it’s not an actual released game. It’s made up as the central element of a light novel series of the same title, later adapted into a popular anime.

Hi! I was just going through the same dilemma, so you might find comments under my post helpful. Be warned though, as you lean towards S1 Pro, I was also biased, albeit towards Prusa MINI+.