I do it all the time! There are times to defend, but B is almost always one of the most hotly contested and valuable zones to hold. If you can take A and C, generally at least two of the guardians on the opposing team have to go take one of them to get back advantage. Makes it easier to mow through the four left holding B, take it, and then hold either A and B or B and C. Just my personal preference. Plus there’s the small side skirmish with the people thinking the same thing that is usually pretty intense and fun!