Then let's start with Royal Arty, because that one flares the entire map.
I agree it needs changed but arty regiment flares is more expensive and more expansive but less versatile. It's arguably more acceptable because it's more predictable and less flexible.
It can't (or rather is extremely unlikely) to be combined with an off map because it's more of an Intel recon than a spotting recon (if that makes sense)
You see a lot but not necessarily what you want to see with Brit recon flares where it's the opposite for spec ops flares (which is why they are so problematic)
You see exactly what you want and the enemy can't do anything about it, hell they might not even know its happening
Meanwhile Brit flares covering such a large area are more likely to be noticed AND offer less utility.
. If any of that makes sense