I think the main reason so many TTRPGs are heavily combat-focused is that combat is an easy way to get everyone involved. Everyone can start throwing punches in a fight, but you can’t exactly have five people share a lockpick.

"…so if I make a mistake or forget something, lemme know.”

That sounds like something for Session 0. Because you never know. You might forget something in Session 1.

It sounds awesome, but only if he finds a way to include the other players.