Never said I was 'so good' (or so bad), but all in all it's a good question and actually one that I've thought about often. However there are lots of reasons:
1) Always had instincts for going against the grain trading, nothing for trend following.
2) Have been only counter-trading since I began (long time ago.)
3) Always traded 'worst of the worst' volatility, which can jade someone against holding positions and make that more nerve-racking than higher volatility trading
4) Conditioned addictiveness of quick rewards and taking quick profits (when profitable)
5)All analytics and signals have been built for years for counter-trading, nothing for trend trading
6) Trading (manually) is first and foremost a mental game. All the analytics in the world won't help a manual trader if their mind is not right for what they are doing. But the mental game for trend trading simply isn't there. I would be much better off shorting more often (something I don't do much but can quantify) than starting to trend trade.
That said, not being able to trend trade and hold positions between reversals does suck. But the same could be said about anyone that can't counter trade, as those people would know they miss some amazing opportunities.