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If he wants to use the same EA simultaniously in one MetaTrader (for example, EA on EURUSD M15 and the same EA on EURUSDM5 using one Metatrader on the same time) so it needs to be improved in some cases. Because I have experience when the EA could not recognize which ticket (order) should be moved by trailing stop etc.
Besides, some EAs were coded to open the one order per pair (not per chart).
But sometimes the magic numbers are enough.
And you are right Mohammed: there are EAs which do not need any improvements. Daytrading EAs for example no need any improvements in this case.
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