Profile of nee

so you prefer that the axis and soviet units are speaking in corny english? at least USF and brit voices sound convincing better than those other 3 factions i spoke of. ugh hearing axis and soviet dialogue in english is nauseating.

Yes I do prefer, but I do not think that is relevant.
As for corny English, I'd at least know if my units were being attacked from the flank, or by a tank. That doesn't happen when it's all Russian or German babble. And no, the "but it's optional" is no justification.
The whole eSport thing also doesn't make this a priority.
And I can't help but think they don't want to increase file size just as an option.

Even on free to play like World of Tanks there is an option to have the native langage of each nation : Russian, German, English, Japanese, Chinese and French !

True, but I recall there's far less voice lines in that game, all of it about as much as one language for one faction in COH2.

Anyhow the very fact that for a relatively simple project Relic has never bothered to deal with, shows just how much they care about it: zilch.

Playability/ winnability seems very stronly dependent on things like size of map and number of players.

I mean you're going to get your butt raped on large maps like Red Ball Express if you're all Soviets against OKW, on the other hand things will be different if it's UKF/ USF against Ostheer.

This does't really have anything to do with faction roster and their play style, but it does show that a factor in winnability involves not just unit design but map size design, and it seems Relic didn't take them into account when they make or balance faction design. Hell some maps like Rostov are simply unbalanced purely by which side of the map you start.
If they balance a faction from a large-map perspective it will ruin small-map design, and vice versa.

In any case I disagree with OP, the ideas and usability of the vanilla non-doctrinal support weapons exist in the newer factions. Plus I find it refreshing to play a faction like OKW where you're not entirely dependent on a build order that requires an HMG, a Mortar, or AT gun. Yes you WILL need suppression, indirect fire, and AT capabilities, but OKW/ USF/ UKF already provide those. It's not like you can just volksblob your way to victory points ignoring HMGs and indirect/ AT fire, so it's actually a drawback if you ignore those mechanics or fail to provide tactics that deal with or utilize them.
Myself I've played without HMGs or Mortars or AT guns as OKW, and it's as often not pretty than fun, because while it's not the usual build MG42/ PaK that I spend a year playing Soviets/ Ostheer, it also can make things harder because you don't have them and need to scrounge them up from the enemy. That's fun. If I REALLY needed HMG, I can choose one of two commanders.

It's 3 years.

Focusing on bug fixes and game balance are what I'd think are much more important than a feature that very few people would bother to use, and even fewer would appreciate.

They have no reasons for doing what you want. They aren't going to get paid for it, maybe they are waiting for you to start begging for DLC so they can milk your wallet?

They probably also haven't cleaned up their file archives, hell I'd wager there's a crapload of old CoH1 sound files in there too. I mean CoH1 models made it into the game.

When disembarked player does not have direct control of the crew similar to SturmTiger realod, he can only order them to embark but vehicle either does not become neutral or it can only be crewed by enemy forces.

This makes it effectively the same as Elite Armoured Doctrine's Emergency Repairs, though.

Personally, I think a simple improvement to the vehicle crew concept is that it just lets all your vehicles use the Soviet's Repair Vehicle ability, which allows repair when out of combat and doesn't have the crew leave. This takes out the "crew hop out to repair" tedium, yet the option is there if you want them to take points. Critical Repairs can also be done inside the vehicle.
The one difference is that repairing while inside is only possible if the vehicle has the vehicle crew inside- you cannot do this if you put in other infantry. So you can't put in Riflemen inside, and have RET and the crew repair in the meantime.

I also think that vehicle crews should be the ones using the popcap- the actual vehicles don't use popcap, but do so when non-USF units take over. I dunno if that is possible though.

Some other misc ideas: vehicles with crews can have unique upgrades like applique armour or something.

They didn't so much "gave up" as to "never aspired in the first place".