Worlds Worst, why would ATC follow these proceedured of yours that I quote?
"Now, sure, I could assign 7500 on climb, or 9500 on descent, but my poor old IFR jockey might get real nervous at a VFR level – so maybe, as a caring and considerate controller, I might just pick the nearest available IFR level – maybe, er, let me think, 7,000 for the climber, and, er, um, let me think again, er, 10,000 for the descender."
AIP clearly states that commercial RPT jets have priority over GA aircraft. ENR 1.4-10
What you suggest would put GA VFR aircraft priority over RPT.
You proport to know what should be done, but demonstrate that you don't, this has an effect on you credability.
Your writing demeanor and appararent arrogance suggests to me that you have another agenda to your posts, rather than just to ask why did this happen?
Your post's is misguided, you should be whingeing to the people who make the laws, not those who work within them.