Actually I would argue that this is a higher priority issue than doctrinal flares since it involves stock abilities that are available in every game and not only a specific commander is chosen in team games and his teammate has access to off maps.
I disagree on that.
Royal arty commander is absolute meta especially in team games and Spec Ops is also played very often. OKW can easily combine it with rocket artillery as well, USF and UKF cannot. For team games it takes a lot of coordination because the passes happen quite quickly.
I have to say that I rarely see those recon plane passes, probably mostly because the UKF officer is often not build and many people think that you need to walk close to the point which you want to recon with both officers, since the range and the whole visual information of this abilities suggest so.
But maybe this is very rank and game mode specific. As I said, I rarely encounter these stock recon planes. The only time I see them is when I use them myself.