Like most things in life, it is a question of balance. Any type of air route must be monitored for Civi traffic when Mil traffic is operating near/around/under etc - that is basic airmanship. But it cuts both ways. If Civi traffic decides (for example) to decline the safety of P600 out of Aberdeen enroute to the south and take the direct line to (say) Newcastle - then it passes about 20nm east of Leuchars without co-ord (I say again without co-ord) with Leuchars ATC and then stumbles straight through OTA "C" (LFA 12 / 16), one of the busiest low level/ affili areas in the UK. Not smart airmanship but it saves time and fuel and that is the real driver. The job can be done with a bit of give and take, however in my many years in AD, the RAF do most of the giving and the Civis do most of the taking.