I don't know if Excel has done more harm, but it sounds like the fact that you don't do critical thinking about investment rationale is the problem. It seems l

I don't know if Excel has done more harm, but it sounds like the fact that you don't do critical thinking about investment rationale is the problem. It seems like you need to do both. This seems akin to writing code w/o design. Sure you can do it, but you're going down the wrong path (and I don't think I'd blame the existence of software because some people write code w/o design).