CBM believes that the benefit of STMs is this: there is nothing else that so powerfully helps a Canadian individual or church develop a global vision. Our exposure to different cultures causes us to learn about our own culture, and how to be a follower of Jesus in it. We may discover how materialistic and consumeristic we are. We may be challenged to live as stewards of the resources given to us by God. And we are encouraged to see that God is active all over the world!
At the same time, there are downsides to poorly-run STMs. They cannot replace long- term relationships, financial investment, and strategies. They may disempower local communities if rich Canadians parachute in for a week to do a few things and then leave. An STM may harm the local labour economy if not thoughtfully planned out. For example, if STM participants are painting a church does that mean local painters will now be unemployed?