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Many people would disagree with this premise. They argue that setting boundaries is more stressful than going along with something. They say that it is easier to keep the peace than to disrupt the system.
They neglect to notice the internal stress they are placing on themselves. They are bearing a great deal of weight as they put themselves last and take care of others. The effects of this behavior may be hurt, resentment, anger or even depression. Sometimes these feelings lead to passive aggressive behaviors that hurt others and put a rift in the relationship.
People often avoid setting limits because they feel guilty for doing so. This is what Marsha Linehan would call “unjustified guilt.” This guilt arises from devaluing oneself. When people believe that other people are more important than themselves, they feel guilty for setting limits, which consequently causes more stress for them.
When people believe that their value is equal to others, they are more comfortable with setting boundaries. Maintaining healthy boundaries with others reduces stress and negative emotions.
So, while it may be stressful initially to set limits with others, there is a consequence of mutual understanding that reduces stress long term.