having conditions in the pots be good for the worms is a balancing act but the better it is for them the better it will be for the plant. you're right about moisture being a huge factor which is why pulse watering a mulched no-till pot suits itself to worms so well.
there's no need to contain the worms if they're happy, there's no containing them if they're not
there's no need to contain the worms if they're happy, there's no containing them if they're not