conclusion:
If your opponet play better, have better micro, mulittusking and positioning even RNG god woudn't help you.
But when both opponents have equal micro, multitasking and positioning, those bulletins help.
What do you prefer:
77 muni shrecks or 90 muni shrecks? Even something as slight as 5% increase movement speed, means that you can outrun certain vehicles (Kubel vs M3).
For the Tiger case, being able to get 10% faster to vet1 or vet 2 can mean the difference between a dead Tiger (blitz) or being able to engage at 10+ increased range.
You don't win because of bulletins, but denying that they help is foolish. They help as much as putting barbwire early on to deny cover, crushing fences to improve pathfinding/retreat paths, etc