Quite so. What's it to you/us anyway? Squawking is not just for a "known traffic environment".
Let the radar jockeys do what they're paid for - they can always ignore you when they see you are manoeuvring, or outside their area of interest - but they might still want to factor your presence into their decision making - and why not?
Also, the PowerFLARM and TCAS users can be alerted to you if necessary, which is a bonus to you as well as to them as you say. Even the best lookout might not be sufficient, as quite a few people have unfortunately found out over the years.
As a civil operator then if you have a xpdr I can see no good reason not to use it to its fullest extent. Stack the decks in everybody's favour.