The other side to tbat though is what you mention about a lot of punters all adding the same horse to their tracker after being an eyecatcer. Horses like that create value elsewhere if the race setup is better for something else. Every race has to be taken on it's own merits. One of the things that surprises me most is how often someone sends me a horse and says, "You bet this last time out." I have no snetiment to horses like that and most of the time can't even remember the horse without looking it up. A good clear out of your tracker is time well spent.
Not disagreeing, especially with the first half. And probably for you, Slim, this is all spot on. But (for the second half) it depends to some extent on the criteria you used for making the selection in the first place. And likely the way you arrive at selections (and what types of races you may target) in general.
(...and I know you know all this, but in the interests of anyone reading that might not.....)
For any horse you back, you had reasons for doing so. So unless you're backing with no 'engagement' in the result you should have some recognition/theory/knowledge afterwards as to why it did or didn't go the way you wanted. Knowing those reasons (and understanding - as far as possible - why you were right or wrong) gives you cause to 'remember' the horse for when it
might subsequently run in the way you wanted/expected the first time (when, of course, you begin again in the context of the new race and take all other factors that you see as relevant into consideration, too).
It does, of course, give rise to some situations where the answer after analysis was just 'I was plain wrong'. But, I'd venture to suggest, that would be in a limited number of races (and may well depend on the types of races you tend to follow). The potential risk is in analyzing a performance subsequently and having a vested interest in
wanting to find some reasoning that really isn't there, which is where the emotional detachment comes in useful. Or, equally, in misinterpretation, which is where experience comes into play.
It's a good point about 'clearing out a tracker'. Anyone that uses one (and keeps records, either written or stored mentally) should have some good understanding of whether (and under what conditions) their 'tracker' horses perform over time. And adjust appropriately with experience. Harder to do than to say, perhaps.