Wasn't the JOC thought up by someone at Oxford to suck even more money out of wannabee's??
I can't think of any place in the world other than Europe that require them.
The country where I did my training doesn't even require an MCC (it will soon as our regulator thinks everything done in Europe is better) to get a jet job.
I think the reason for this is up until very recently, you wouldn't get anywhere near a jet for at least 2000 hours. That said though even the low time guys who were able to get into jets seemed to cope just fine with just the type training in the sim. No need for anything else it seems.
Flybe require the JOC is just to filter down the number of applications.