Easy solution: add an active talent to Templar tree that requires 20 points in tree to reach, talent would reduce ARMOR damage by 25% (e.g. does not reduce damage to vitality, just armor). Make it last 60 seconds with a 90 second cool down. Locate in the open space center of row 7 of Templar talent tree (next to Empathy).
This provides no offensive advantage to tank, but does reduce the cost of running a tank. Because tank is the only class that is designed to attract attacks, thus incurs the most armor damage which is expensive. Yes, groups can reimburse tank for costs but they rarely do so.
That was exactly what i said on page 2 X D Good that others agree on it though,repairs get quite costly.