Jack: Your comments basically seem to imply that chart reading is just laden with pitfalls and unfounded assumptions.
Bill: Yes it is. There may be people out there who can do it, but I certainly can't. Every pattern recognition chart trader I know makes the trades he really likes larger than the trades he doesn't like as much. In general that's not a good idea. You shouldn't be investing yourself in the individual trades at all. And it's certainly wrong to invest yourself more in some trades than others. Also, if you think you're creating the profitable situation by having an eye for charts, it's very difficult not to feel excessively responsible if the trade doesn't work.
Jack: Which, I assume is bad.
Bill: Yes it's very destabilizing.
Jack: Whereas if you have a mechanical system, that's not a problem.
Bill: That's right. Your job is to follow the system. If the system does something that results in losses, that's just an expected part of the system. Your judgement might be on the line over the entire performance of your system, but there's no sense in which your judgement is on the line on any single trade.