Defenses should defend and super-powers should destroy all. It's this obsession with "flow" that has caused this. When trapped by impenetrable defenses, most people give up instead of retrying multiple times to get past them. Super-powerful attacks are deemed BS by anger-management-challenged individuals which causes them to give up. Games that make you feel good are popular. Using intelligence and perseverence to overcome impossible obstacles or accepting your failures are both deemed frustrating; we wouldn't want to feel BAD playing games, would we? Keep in mind that this is a theory I came up with, and I like the idea of speeding up the game with weaker or lower-duration defenses. I like many unique ideas.
Operatives can (and I do this) turn turrets into impenetrable killing machines instead of harassing the enemy btw <-----