I think it can be said that trading was once mostly a matter of strategy.

That was before the advance of technology when:

1. The focus was mostly on larger time-frames.

2. People could hardly check their positions 20x a day.

3. Commission rates were astronomical.

These things made compulsive trading not impossible but difficult.

Nowadays, technology has changed this. And, as a result, more than ever trading is now a matter of mindset.

Yes, you need a winning strategy, but because of the rapidity of market feedback and the ongoing noise, you also need to be extremely disciplined, objective, and good at managing your states of mind.

Believe it or not, it's very hard to keep things simple like the olden days, but therein lies the secret.

“Mastery comes via a monomaniacal focus on simplicity versus an addiction to complexity." ―Robin Sharma