Hello Jay-R,
sorry for the late replay, I have missed somehow the new posts here. Thanks, Bart, for answering!
The difference is that in MT5 you can add to the position and in MT4 you will add another position.
For example, if you trade with 0.1 lot and you have a strategy that allows maximum to 0.3 lots, in MT5 you will see in your terminal 0.1 when the new signal comes, it will rise to 0.2, and then to 0.3. But in MT4 you will see 3 orders with 0.1.
I guess this is why he said that
Hope that makes sense.
Kind regards,
Petko A