Why do people keep changing their methods?

[Kevin1814]

I see that there are a lot of people who have been in the market for many years, who have very good and very wide knowledge, they know many trading methods and many of them are really good.
But it's strange that they still keep changing the method they're using, it's obsolete, no, it's because they don't persist in pursuing any method to the end, they just want to experiment and find more because they always doubt their own current method.
And I believe they will stay like that forever and can't be stopped for a lifetime.