OK. It makes sense to call out the true wind so that it can be used for plotting. The next question is "why does the FMC not give the true wind on the POSN RPT page"?
Can't help you there with modern FMC,'s however...the 'ole Hamilton Sunstrand FMC on the Lockheed tri-motor would give you mag or true winds, with just a push of one switchlight, IE: displayed either way you desire.
Older is better...
