In your videos, I don't see anyone jumping out of their APCs in the open straight at the opponent's face, ready to be cut down by HMGs and MMGs.
Sure, they are meant to evacuate the APCs fast. But not at point blank range.
That's why APCs have guns on their own. Problem you are describing happens a lot in urban warfare. If that what you are saying was true, no one would ever jump up from his APC. Point is infantry empty APC fast and is ready to fight... nothing like this...
...jumping off from an APC to shoot immediately with perfect spacial recognition, after a move at 70mph on bumpy terrain, a sudden stop and disembarking on an open terrain is absurd...
And enemy being or not in point black range is variable where is preferable to unload troops in safety but sometimes not possible. However I think when you meet enemy tank in point black range, it is better to jump from your vehicle and try luck with RPG than waiting until it will make an oven from your APC using HEAT round.
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T-72M1 <- gun's range buffed to 2275m <- might solve few issues, worth a test.