That doesn't make any sense. In the early-war period the Germans put their emphasis on speed in order to have proper Blitzkrieg tanks; their tanks were therefore similar to the British cruiser types. These tanks had good speed but limited armour, and usually a reasonable gun. Only later did the Germans switch to building heavier tanks, mostly to fight the ever-growing number of Russian mediums and heavies that could only be effectively fought by fewer tanks if those fewer tanks were more powerful. When judging the British tank doctrine, at least do incorporate the two distinctly different basic tank types the British made, being fast gap-exploiting/tank killing tanks and slow, heavily armoured infantry support tanks.