Frequency change questions

So as most of you know, to change frequency you have to press back and switch to a unicom frequency, why is this the case? I always thought it would be easier to just press back and have left the frequency instead of having to switch to unicom. You also have to remember a lot of the pilots do not know about IFFG, IFWP, or Infinite Flight Community so they have no way of knowing how to do this properly (unless they figure it out).

When you press back you are still connected to the previous frequency.

If you find yourself repeated ask for frequency change and getting approved for it, you’re doing it wrong.

Your point?

My point is that you haven’t actually changed frequency, other wise you wouldn’t be contacted in regards to frequency change.

I know, the topic was about why we have to switch to unicom though.