DCS is being rated top by graphics, not game play, in fact it's rated low for game play. It's a SIM, not much more.
AH, because of MP, is much more fun then DCS and IL-2, no matter how you cook it. People who like strictly sims with a touch of game play kewl, have at it, you're in heaven. When is DCS going to decide on a single FM?
AH players are about game play and numbers in a single arena. DCS can't and will not touch that. DCS and WT are money pits that are slowly losing their numbers. Their peak is over. they have who they have. Some have returned here.
The human eye needs 1-2 seconds to focus,... ultra detail of an AC doesn't matter at all when it's gone in 1 second.
No matter the subject,....DCS. Usually a slightly negative thread of AH, DCS! I think some spend more time here then playing it. I do believe the subject was Active Players in AH. <smh>
In the "hayday" of 600 players (even +200) you are correct that AH was the place to be. Unfortunately, that has not existed for a long time, for a variety of reasons. When the numbers in AH are low there really isn't much to do, so AH and your sim gear sits idle.
Where DCS and IL2 endure is a decent A/I that allows for PvE and single player. With combat flight sims being a niche, the more you have to rely on participation of others the less "bang for the buck" you are going to get. You only need a couple players with PvE to have fun and the comradery. If you only prefer going against humans then both DCS and IL2 have smaller maps and therefore you only need about 30 players, which is not hard to find at all.
When I could carve out some time to play AH my routine was to log in and see if there were enough players with a decent dar bar indicating a good fight. Those instances became fewer and fewer, which resulted in logging off and finding something else to do. With DCS/IL2 I can check for the same things and, if it is not available, I still have a wealth of single player missions available in whatever aircraft I feel like flying. In short when I feel like I want to fly combat it is available 24/7.
With WWII aircraft, the graphic detail becomes much more relevant. Not long ago I was flying a pony mission in DCS and lit up a 190 at point blank range. Quite something to SEE the 190 canopy fly off and the pilot animatedly climb out of the aircraft to bail out. Detailed ground terrain and ground units, along with good smoke/fire affects, increase the immersion and that is why we are all playing.
Bottom line is playtime is one of the most precious human commodities and everyone has to choose what gives them the most satisfaction. Don't let any one game make you hang up you flight gear without checking out the others.