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Also, please do not reply until you see at least 20 votes.
I know you requested not to reply until 20 votes (don't know why) but i must provide a link from an article that i find quiet relevant to this poll. It shows by example that performing the oposite trades is not always the most profitable path:
You'll want to look at point 4.2.
Before i will agreed that reversing trade will turn into gain, i want to see if there is any EA that always lost open position. I have tried to reverse trade but it turn to lost. So we need an EA that always lost in order to agree.
Most of time No.
Your question is framed in the view that market is linear.
In the linear market, yes, reverse trading logic will provide you opposite results.
In nonlinear market, your losing EA is losing because they just enter the market wrong timing as well as frictional cost. Reversing the trade will provide your EA to enter the market another wrong entry timing.
Financial market is nonlinear, the simple reverse strategy is very hard to become good strategy.
I often tried to revert losing EAs for me or some clients but most of the time it was even worse.