No ridicule ????

You're in the wrong forum.

So, what's in the flight plan concerning my descent speed ? Is it 250 or 320 ? Same for climb. The answer is nothing, of course.

My advice from this side of the mike, control the traffic. Assign speeds if there is the possibility of getting two together.

Now for one of my ATC war stories. When United started their TED service in the mid 90's, they decided to climb at 180 kts. Of course, no memo to ATC. Even though every aircraft was assigned 250kts out of SFO, the first words typically given to the front aircraft by the center was "resume normal speed", of course, ASSUMING they would speed up. Naturally, that first SFO TED departure slowed to 180, while the Challenger jet behind increased to over 300.

Deal.

Vector for spacing, assign speeds to keep it, and don't assume anything. Basic ATC 101.