Since we've had ADSB, we seem to be identified as soon as we contact ATC with our departure call (after we've done the after takeoff checklist). So I imagine that's above 3000' by the time we've cleaned up and done the checklist.
With regard to traffic, we devise a proposed plan of action. We NEVER "tell" any traffic what to do. And we encounter pilots with far less than 200hrs, Dick. Quite often it is pre-solo. The one size fits all approach does not work.
If the traffic is assessed as a conflict, we make a suggestion to the conflicting traffic that will ensure separation. The response from the other pilot will determine the next course of action. If we believe the other traffic either does not understand the suggestion or is unable to meet the proposed action, then we adopt a conservative approach and take an alternative action. That may mean delaying action on our part until such time as we assess the other traffic as no longer being a conflict.
Contrary to popular belief (and it appears to be your belief, too Dick), we don't just barge into the circuit and tell everyone to hold or get out of our way. Separation is a mutual responsibility.
Having said that, in my experience most of the schools operating at ports we go into are very good at training their students how to deal with RPT movements. And they do this very well.
You've been an IFR pilot for several decades, Dick. What is your methodology for separating from less experienced pilots than yourself?