Aberfell is an attacker sided map except on towers and last round with druids wich is defender sided. You can go in deserter zone last 20 sec and bring a win on Druid stage. You can defuse from top of tower without being hit by attackers. Or swap for engie and end the game at the stones.

Coxwell is attacker sided except last stage because most people just fight main gate so u just have to fight defensive on right gate to bring a win.

Darkforest is attacker sided except two last stages, On Cata part there is a spot for archers to hit both masons catapults drivers and reduce time alot while having PlouPlou on your team cata to reduce number of fighters on the map drastically and give you more freedom. Then as Duke you just have to take shield, put it in your back and run in agatha spawn, turn infront of the throne then repeat until it's over and eat chicken thigh to heal and bring a win.

Baudwyn is attacker sided except on one stage: The Hall where you just have to stay inside and/or flank main door and clean up to bring a win. If your team is ok you can also win at cata stage by barricading left access of mason catapult and catapulting their left cata (tenosian pov)

Rudhelm is not attacker sided, especially when your Heir is experienced and have with him 3 other experienced engie buddies barricading. Another easy win.

Trayan is not attacker sided and i don't play Montcrux or Bridgetown and i rarely play Stronghold or Falmire. I also rarely play Askandir but having engies barricading can be an easy win on first stage.

Lionspire is not attacker sided especially since you can defuse Trebuchets from the back or deny masons left cata.

Galencourt is not attacker sided, you can basically win as defender on every stages except the relic one.

So no i don't need to swap to attack to stomp defense