What I mean is that when a trader enters a trade they do so because of X (may be fibonacci, elliott, moon cycle, S/R, MA, MACD, etc.....). So when they go long they are signalling that due to X they believe (or forecast, or think or hope, etc....) that the price will go up.
And when a trader goes short they are basically saying that due to X (whatever it is for them) they believe (or forecast, or think or hope, etc....) that the price will go down.
So by that definition, we can say that whenever a trader goes long, they are in effect "picking" a bottom; and whenever a trader goes short, they are in effect "picking" a top. Making the whole question a moot one.
But in the end this is totally not the important thing to focus on in trading as it is not among the defining variables in success.