What do you mean by this? It already reports Linux in the navigator UA, are you talking about the HTTP header? If so, I agree with you and I'm hoping to see a change as it is overkill (although there are reasons against namely passive fping protection in some rare cases).
It causes breakage too, ideally reporting this could influence a change in RFP but there are some blocking issues (things to discuss) at the moment and it is low priority. We could anticipate the change with a patch but we haven't thought about this yet as we are usually against changing RFP.