I was once given a telling-off by an Examiner when on a renewal at Blackbushe for joining over the 07 numbers. He said that it wasn't the C152s that were the problem but the high-performance a/c like the B200 etc that could well intersect with you and that a mid-point join was SOP. Such nonsense from a so-called examiner. The Be200 pilot would know from his self-briefing that the circuit height for singles is 800 aal and would receive traffic information on joining traffic from FIS anyway
OK, I'll try that in my little jet, and see how you like it. The CAA Air Traffic Engineering decide on the DOC, not FIS. It's a way of sharing frequencies around

I'll accept '5 minutes flying time' to the ATZ boundary in 'your little jet'. Or is it a Lightning.....?