For infantry vehicles, I'm happy with them. But if anything, a very slight health buff. Let's day 10. They are powerful to use. But the drawback is that your exposed. So 1 rocket and your done is reasonble, no? (Assuming we're talking about the truck with gun on top?...and that vehicle is clearly not armoured).
I think tanks are perfectly fine in terms of their current health. I play them, and I feel perfectly fine with it. Sometimes I last long, sometimes I don't. They are very powerful machines, tbh. And the reality is, tanks can be taken our quite quickly with modern technology.
If you want tanks to live long, you need an engineer. That's the point of them...
The thing with tanks is that they feel weird to control as do other vehicles.
In terms of helis, I think they're just **bleep**ty to use right now. Evasion is hard because of it. So I think thst needs to be worked on first and then see what happens.
For RPG's, if anything, one less. That's it.
And tanks are scary if you're anything but engineer. And tanks are afraid of engineers equally. Is that not fair?
I'd agree helis not being much of a concern, as well as jets. No fear for them at all. Lol. But they have movement issues, so they can't pefrom well to be threatening.
The maps probably aren't big enough to have 3 helis. That's sounds like a lot for them maps. If anything, decrease heli spawn timer.
That's my opinion.
Edit:
Also, like you mentioned, their might be new tech releases upon full release that enhances the players tank survivability. Then again, their might be more tech to tske them out. And if they're suffering more then, the a health buff would be reasonble for a tank. Especially if they include a mortar, and if they have anti-tank FPV drones...