It adds more realism and gets rid of the absurd contortions devs have to do in terms of level design, art design, architecture, etc., to make everything relevant visible/interactable on the 2-d plane while still trying to give the impression of a 3-d space.
What matters is good gameplay and pseudo-iso games that demand frequent rotation are an ever-present irritation that feel worse than any game where the camera is static. When playing Neverwinter Nights or Dragon Age I never felt "oh yeah this feels far more realistic than Baldur's Gate."
"Pseudo-iso" lol
Of course not, because you're used to, and have grown familiar with, the limitations forced on game design by older technology.
To me, the ever-present irritation of strict isometric games (apart from the absurd visual goofiness of the strict isometric perspective itself) is that I
can't spin/rotate. It never feels to me like the illusion of a real space I'm exploring, but like the illusion of a queer proscenium, set set up specifically for my convenience.