Rusty's arguments here are like... 6/10 quality? Which is totally reasonable as why waste 10/10 arguments on a 0/10 discussion?
If you keep falling back on "Well if you want to move fast you must not actually like playing games" then you lose. You have lost the argument. There's bad faith, and then there's... stupid faith? I don't even know what to call it. But it's a complete failure of an argument and you should be embarrassed to have made it. The shitposts you get in return for that are more humor than you deserve and you should count yourself lucky to have received them.
To be serious for a moment, which is far more than this thread deserves, but I can't help it, yes, I get it, to a tiny degree. Immersion is helpful to a fun gaming experience. Sometimes everyone running around constantly, with swords drawn, is detrimental to that experience.
That said, there are other things far more detrimental. Such as, being bored spending 20 minutes watching my character walk somewhere with no danger. Such as, reloading the game again because oops, I forgot to press sheathe weapon and now I've aggroed the guards/shopkeepers/whatever.
To be completely honest, I don't think isometric RPGs are the place to go looking for immersive travel to begin with. Sneaking around a dark environment hearing monsters lurking around, and hoping they don't find you, is pretty immersive, but that's an entirely different genre. Although I'd love to play a system shock/skyrim/fallout hybrid and I imagine it could be pretty incredible. And in that theoretical game, it'd be a crime not to include some kind of quiet movement, ideally separate from the crouch function, but that's a whole other can of worms... And obviously, in such a game, you'd need some way to run. And you'd probably even have some limitation to running, perhaps a stamina meter. And of course a magic elevator that fast travels you around so you don't end up walking down empty halls over and over again for no reason.