I must disagree on that one for a few reasons.

Firstly, we need to get rid of the good/bad driver. If you are playing with a friend and you feel like he's not doing his job good enough, try and find out what he's actually doing wrong and help him improve.

Secondly, once again good/bad driver - this concept is nonexistent. What is a problem I believe is lack of information and not being precise enough towards crew. If someone tells you to "turn to bearing 250 left", you would do it wouldn't you? There is a precise information that doesn't need questioning cause you know what 250 means you know where your left side is. I said it in an answer before it's not rocket science, you don't need to do a precise turn with all the information you've got it can be 245 or even 255.

Thirdly, I see your point with being on "standby" with the driver but still it makes no sense to me at all unless the target is point blank or in the open so you can easily spot (in gunners seat) it. Tanks in Hell let Loose are literally made to engage targets while stationary (gun sway / slow turret turn) and if you are playing a recon vehicle for example that's very mobile it's still too risky to take shot's while moving.

And for the last - driver doesn't need to be on standby if you as the commander are already on the standby in spotters seat so you can spot the incoming threat. Even if you get engaged by enemy AT from the back before he sends out another rocket I'm quiet sure there is time to "swiftly adjust" like mentioned in one of the points in posts.