The problem with "just buy a mortar" is the opposing brit player doesn't have to do that. So he gets another section or something else because the MG can both dislodge other MGs AND doesn't have to spend manpower elsewhere. Similar problem with the zis barrage. Yeah it's an AT gun but it can also just get rid of MG teams because it's a "field gun". Even though soviets have a perfectly fine mortar. At a cost? Sure, but if it makes your opponent retreat and you get territory for it it's all worth it.
I do feel the ZiS barrage is even more useful than this ability though. And easier to use. Like I agree the stats of the ability are very very good, I just believe the requirements for using it are a good balancing mechanism
Really am trying not to sound elitist right here but you should try paths (probably I&R paths) against OST players. When they go MG42 opener which basically is 90% of all games it just invalidates the MG because your troops can see it basically all the time. And it's "balanced" you could say because paths otherwise are pretty meh alone in combat and airborne ones are just in need of help and the doctrines are meh etc. It is really is frustrating to have the backbone of your OST comp just not function because of a single unit.
I use paths from airborne frequently in team games. They are super useful and very underrated. If this is about scouting then aren't pyro tommies the problem? I see your point clearly but I don't get why it shows the new ability is an issue. Like I don't think pyro tommies needed smoke tbh which sort of relates to this situation
Lastly I never liked the "Well MG damage doesn't matter because MGs shouldn't fight MGs for long periods of time" arguement. Yeah in a perfect world everyone has mortars in their comp and has flanking infantry and smoke etc, but it's no secret that in teamgames when you're holding a garrison and your opponent is holding the other, damage is what matters, and the vickers is no slouch in that.
That's valid but it's also kinda why I think the ability is fine. This is just giving the vickers a better version of what it already does
The pen bonus doesn't make any sense to me though. That seems completely unnecessary. Like lights should able to run up and get behind the Vickers easily while it's using the ability. Brits are okay against LVs now I don't think they need more soft AT