I will keep this short and simple--and this post is to open our trading understanding a little.
As the title reads, oh yes, it's true, but they still lose.

They are busy chasing a better strategy that can only exist in their imaginations, thereby losing focus, and then style drifting.
Those simple strategies you undermine are enough for you if you work on yourself. I was shocked when I realised someone bought a trading strategy for $3,700...oh my God!

And guess what, it failed him, what a waste!
A good trading strategy is important, but what traders need to succeed is not an absolute strategy that gives 100% winning. A 60% winning strategy is okay if you can work on your
trading psychology and
money/risk management. As simple as the two are, they've reshaped my trading results for good.
Reshuffle that mindset and see the result in months.
Your personality reflects in your trading lifestyle that's why the strategy the trader bought failed him, the strategy might require a deciplined minded person, patient and risk management approach to work but the trader isn't that kind of person, he thinks since this strategy is working for the person he bought the strategy from, it also will work for him and without understanding or knowing what principles are behind successful using of that very strategy.