Great explanation by @Eklavya
The main reason you even want to consider Sabotage is to help your alliance will capture a sector.
You Sabotage their “Defense Boost” and now your attacks have a better chance of beating enemy teams.
You sabotage “HQ Boost” and now the enemy team has 5% less overall power when you are close to enemy HQ. Makes a huge difference.
You sabotage “Surprise Attack” to stop an enemy alliance from trying to capture a sector when they have no supply line.
You sabotage “Infiltrator” so an enemy can not sabotage your Technology.
You sabotage “ReCapture” so they can not get 30min shield during the capture of an enemy defending an attack by you.
You Sabotage “Attack Boost” when you know they are attacking back or trying to capture key sectors.
It all comes down to strategy and sabotaging the right tech at the right time in crucial moments. You have to become a tactician in war tactics and plan execution.
Hope it helps and feel free to reach out if I can help in any way.
Best of luck and happy hunting in AW!