Offmap should have never been in this game, they aren't counterable, they're incredibly easy to use and they completely ruin the experience for someone who's carefully set up a town or forest defense.
Wargame: "wah, campers, camping, sitting around in a forest is OP, static game" Eugen: "Ok, here's a way to force players to move isntead of just setting up a static defense and sitting there" Steel Divison: "Wah, offmap is OP and it stops my turtling static defense"
Maybe I've just been playing wargame too long but it's honestly laughable that people always cite the exact opposite things as "ruining the game" each time they implement something to fix the previous complained about thing. I understand that people have different playstyles and prefer different things, but it's not each of these exact opposite things that are killing games. People will never be satisfied by anything.
Why does the Beute Firefly exist in Phase A? The allies don't have a single unit that can reliably counter it.
It's also largely unnecessary, an overinvestment of points for something with vastly overkill power against the typical phase A allied units. Yes it's powerful, but it's usually not worth the point investment at the beginning and without it there'd be cries of how this allied unit is OP or that allied unit is OP because the germans have nothing to counter it.
All of these things may be statistically balanced in some manner but they are a headache to deal with and suck every bit of fun out of the game. I find myself logging off very quickly now after I get hit with a bomber train that charges right through my AA and annihilates everything, thanks to the asinine sword and shield system that heavily favors airborne decks. Or after an enemy player takes the town I just fought 5 minutes to take and calls in a fuck-you-I'll-click-my-instant-win-offmap-arty button and level that entire town.
Instead of ragequitting, have you thought about, idk, modifying your tactics as to reduce the advantage of the enemies whilst promoting your own advantages instead of just doing the same thing over and over and getting owned in the same way? Maybe. Idk, maybe that's something that should be reserved for another genre, perhaps that's what clicker games are for idk.
It's like dealing with Maglans in Wargame Red Dragon but on steroids and almost every division has some near uncounterable unit that succeeds far more at ruining the experience for the other player than anything else
Many divisions have strong units that are countered by other units or clever tactics. I don't know if any of what you said is the "reason people are leaving" but frankly from where I'm standing, if this is the reason the playerbase is dropping off then it's more accurate to say that the playerbase is dropping off because nobody wants to play RTT games right now.