Do we know if it was an intentional decision or an inadvertent omission/bug? Has anyone queried HTC about it? 
They don't reply when asked directly... In the beta forum when I asked why the icon question was never answered... my post was removed.. Id say they are making a statement...
I have notest a drop in participation in the AVA since icons were turned on. That would make sense as the AVA was a ghost town before, with icons on..
Admittedly I was the impetus for the no icon movement in the AvA... I recommended that icons be turned off about a year and a half ago and was granted my wish....I recommended smaller maps, shorter base to base proximity as well as consentrating the available air craft to bases that were in close proximity to each other and turning off or neutering far reaching bases to consentrate action. With those recommendations the AVA population started to grow there were 30+ nights... squads were coming in the arena had lots of momentum... until certain AvA regulars started to berate folks for using team work and tactics.. squads like loses deuce and other respectable units pulled away and were run off. I recommended that folks that berate team work in the AvA be ban from the AVA berating players for utilising wing tactics should have never been allowed to take a foot hold...
The decision to turn icons back on was not a good one for the arena.. but the intention was well meaning... Some times you cant see the forest though the trees.
It was simply a bad choice and the proof is in the pudding... Now that they are turned on again... the AVA is slipping back to its former unpopulated sate.
Its a shame really as no icons were actually a draw for many.
It afforded a new and interesting challenge for those that were looking for something different...Unfortunately the topic is polerising and boils down to two groups..
for
those that were dedicated enough to master the no icon style of flight simming... all of whom are forward thinking guys who utilize new advancements in flight simming like the track ir.. and
The
folks that don't use track Ir. They are the same folks that wanted icons turned back on. That is a shame because there unwillingness to move away from the hat switch held folks back from taking flight simming to the next level. as a result the AvA is slipping backward..
Mediocrity breads mediocrity. "Great spirits will always encounter violent opposition from mediocre minds".. Albert Enstine..
Until folks start to see what they are missing and how pure flight simming is w/o icons here in AH, this sim will always be considered a kiddy air quake sim to most in the global flight sim comunity..