This actually went up on the WoT Console channel a couple of years ago, but it seems not too many people go there. So, re-posting here. Although this primarily refers to World of Tanks, the problems inherent in research applies to basically any game or even scale modelling.
Since this video was made, the priorities in game design and balance may have changed.
The address for that bookstore, by the way.
Librairie de l'Escadron
Rue de L'Escadron 1
The Chieftain (Real name Nicholas Moran) is Wargaming America's resident tanker and amateur historian.