I agree that indicators are not a guarantee that we will succeed in getting a profit in trading, but indicators only make it easier for us to read
market movements. Other things are needed such as risk management and controlling emotions to be able to make the right decisions when trading.
Then don't forget experience is also an important factor in order to avoid mistakes in trading. So a lot of factors that we have to combine,
in order to maximize profit when trading.
But if you can really manage to use it, the chance is higher than those who know nothing.
Even though it guarantees nothing, however, it is a big help when creating our TA's which gives us more advantage. But of course, it seems to be hopeless when we are emotional traders as this thing could just be ignored as our mind has been controlled by our emotions.