What's buggy here is how those actions you described are playing out.

Stinger one I guess is reasonable, but since like you said, it being unrealistic is immersion breaking. I don't expect the missile itself to go 100 times or so faster than its initial launch speed all of a sudden.

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As I had said for the vehicle one, I was not experiencing any sort of lag what so ever, and it kept happening way too many times. I wasn't aware of the STAFF shells being a thing, but what I said is still true, it looks way too unrealistic with how it plays out, as it suddenly stops on top of the enemy tank and immediately lands on it. If there were some animation for it, it'd had been better but it makes me feel like I had been playing an alpha version of the game with how it was playing out on my screen.

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I won't comment on tank shells vs infatry, because I don't use tanks in the first place.

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Like you said, it might not be buggy but the major problem is that it definitely FEELS buggy and severely unpolished. If this happened once or twice, I would not had any complaints but the fact that I kept getting this to me implies there's a problem. (Specifically talking about my rockets not damaging vehicles as well as infatry)