Yeah, when I’m playing solo I tend to save the game and auto-resolve almost every fight. I think the game I won a long campaign (Dwarf faction) I probably played a dozen total fights and auto-resolved … 100 or so. That might not even be hyperbole.
Fight the earliest fights though, to get a sense for your units, and fight at least some of the easier fights to get a sense for tactics, so you know what you are doing with the tough fights or the ones the AI just will not win for you. There have been some of my favorite moments in gaming right here with TW Warhammer where I take a small garrison and actually hold out against a superior force. That shit never gets old.