Holding on to the points I gain is in my eyes one way of defense strategy ,ofcourse the best defense can only win sometimes not verry often.
I think thats the reason why the most players like to beat the game on offense tactics with the respectful high up boosts.......
The problem with not losing points to losses is the 'cost' in using city space to have such defensive abilities. The wasted space on PvP and city defense (to actually win attacks) is far better used for anything else !!!
I see high Era players with 1500 defense in PvP and laugh. (they do have the right to play as they wish, no problem) but all that City real estate could have been used to produce something of value.
For new players City defense for counteracting Plundering is a concern. But later on. when one can collect on time once a day, city defense is an unneeded luxury. And the same applies to PvP
The small cost to let the few losses occurring mean nothing compared to beating the vast majority of higher Era players (in PvP)
I'm in SAM Era (just got to 2000% attack army Defense in one city Whoo Hoo !! ) and can beat PvP Venus players with over 1500%D So every single day those guys are wasting around 20% of their possible earnings from City for nothing except a few wins in PvP? Not even close to worth having.
And as I wrote they have every right to configure their City to do what they enjoy doing.No problem. I'm just explaining why it could be more efficiently used.
The other side of this. Attack and attack army defense is more useful by far. being used in GvG GbG GE and PvP plus in Continental Map exploration (instead of Negotiations) In quests, and in SAM to gain Mars Ore.