1 EA for Longs and 1 EA for Shorts

Basically there are 2 identical EAs which the only difference is 1 only open Long trades while the other only open Short trades.

Why not just 1 EA which can open Long and Short trades simultaneously?

We may all heard of such EAs boosting while the Longs EA loses, the Shorts EA wins and not only that, the winning trades are more than the losing trades.

How is that possible if there is no strategy behind these 2 EAs.

So come to the main point of this thread, can anyone who have deeper understanding of such EAs, come and share his/her knowledge?

EA - Expert Advisor.
Expert Advisor is an automated trading system linked to a chart. An Expert Advisor contains event handlers to manage predefined events which activate execution of appropriate trading strategy elements. For example, an event of program initialization and deinitializtion, new ticks, timer events, changes in the Depth of Market, chart and custom events.
In addition to calculating trading signals based on the implemented rules, Expert Advisors can also automatically execute trades and send them directly to a trading server.

You can put any code in your EA, so one EA will open Long and Short trades.

There is some strategy. It can be very simple, but to open a trade EA needs some instructions and we may call it a strategy.

Look at a eur/usd H1 chart from June 9 to June 14. There is a clear downtrend, that's why EA that opens short trades would have more winning trades.