Engines are good training. They're just frustrating to play against because they will not blunder and punish any tactical errors, and are extremely resilient. Even GM's can make careless mistakes against a computer that can blow their position apart or lose the initiative. A computer would never do that, though, although they can make positional mistakes of course but they're too hard to punish. I bet frustration is the reason why you wouldn't want to play a CPU, which makes it boring. But if you're 2500, you should have the patience to at least draw consistently.
Yea but I'd have to sit down and play a computer for a significant amount of time. I just can't bring myself to do that. I only play longer games with human opponents. Don't worry though, I'll end up proving my prospective 2500 rating the old-fashioned way.
I was not expecting that.
It may be possible to get to 2200 without theory (I think this means they have natural talent) it shouldn't suggest that opening theory can't help or actually hurts you unless it's all you do. I studied openings and strategy because that's what I enjoyed, but I have to work on tactics to to get to the next level. It's not the most important thing to learn, but it's still a good tool, and for me it's just plain interesting!
Wild Fire, could you post any of those games you played? It'd be interesting to see you own a master.