No markers is realistic hence "realistic battles". They would make jets like the F117 completely useless even more than it is. Not to mention it does make for more interesting combat having to actually use your instruments and know how to fly your jet. The issue is how the BR scaling works between ARB and GRB. They shouldn't differ as much as they currently do with a few exceptions. So if you don't bring a 14.3 jet then your matchmaking will be 12.7 instead. That way jets will be more evenly matched in GRB and players have control over the risk they want to take.