Skirmishes against the Garleans

[Betelgeuzah]

As an example: if the Garleans arent stopped and take over a Camp or territory you cant do Quests for that Area or you get only quests to help to free that Area again, which will provoke the Garleans to attack.
Or it will also be a Skirmish like Attack or Defense.

I don't think they should lock out quests, that's too much of a limitation in my opinion. There should be increased Garlean activity on the region to make completing the tasks harder, but they should not outright lock them out completely.