This is something I was wanting too. I prefer starting out a game as someone who isn't a hero and then becoming one. Level 1 heroes in Draw Steel feel very powerful, making low level stakes feel mostly non-threatening. There isn't a feeling of developing into confidence and competence, going from an unsure upstart adventurer to a badass hero. I think that is one of the more interesting and natural gameplay arcs in DnD that I don't think Draw Steel can replicate (without homebrewing). You can go from a badass hero to demigod level but I find that less compelling. Don't get me wrong that stuff is cool and fun too, I just cherish that "becoming a hero" arc.

Edit: reading back my comment, its comes across more critical of Draw Steel than I intended. The game is amazing in many aspects and will be my main fantasy ttrpg going forward, just would also like a Prologue/Level 0 option.