This is priceless... I have never played DCS....
LoL. Fugi is another one of those that thinks they have been left in charge around here. You dared to have an opinion without getting his permission first.
A player level option to filter out the kill messages out of the system messages would be a perfectly reasonable compromise that couldn't possibly be overly difficult to implement. Another checkmark in the user settings.
There is a similar precedent in the chan 200. To maximize the appeal to new players, hide the ugliness of chan 200 until the player learns enough to figure out how to tune to it. By then, if they are going to subscribe, the sale has already been made. Meanwhile, vets are free to tune to it if they are in to that sort of thing.
In this case, by default the kill messages would be enabled to give the maximum impression of activity to a potential customer. However, once they have learned enough to figure out how to turn it off, they are probably at the level they don't need further convincing and the setting will allow the vet to tune out the noise if they prefer.
Both use cases can be satisfied with a minimal feature.
You of course won't get it, but not because it isn't a reasonable compromise or it being too difficult to implement.