Good work with these statistics.
I see there are many people who thinks that Axis "popularity" is due to the fact that they are more "easy" to play. Let me ask you something: If a game has several factions, what would be the faction you would play the most? The most OP (strong overall, standard units and easy to play) or the one who is more challanging (high risk-high profit, cool units, etc)
That's the question you need to ask yourselves.
I would, that is why I play mostly allies.
When I play OKW I just spam volks, throw 10 ammo mini nuke grenades everywhere, spam panzerschreks for AT, get a single Ubersoldaten squad that easily racks up 60+ kills every game and get some panthers or a KT to finish of my opponent.
Teching costs are absolutely nothing with OKW and their volks are incredibly cheap to reinforce in the lategame considering their effectiveness as both AT platforms and mini-nuke lobbing AI platforms. That is, if it ever gets to that and the game does not end with kubel/pio/truck cut-off push shenanigans.
If you want a challenge, play Soviets while using doctrines without call-in tanks. See how your first T34/76 gets insta-countered by 3 panzerschreks and how your basic infantry gets shredded by übersoldaten.