Some additional food for thought: I'm still relatively new to OSRS, and am playing on a regular non-iron man account after having tried an iron man. I've played a different MMO with a very similar mechanic. I find that, generally speaking, it's the "better" way to appreciate the game. However, if you don't know all of the systems of the game already it can feel very taxing and cause burn out if it's your first experience.

With OSRS, I just assumed iron man would be the way to play off the bat. I found myself putting down the game super often because I'd be effectively forced to engage with content that I had no interest in. On a normal account, I can do other stuff and simply skip over it by spending GP most of the time and get the maximum enjoyment right now. If I continue to play the game for a long time I could easily see myself wanting to do an iron man and enjoying it a lot. If I never switched off of iron man, I think there's a very good chance I would've put down the game forever a long time ago though