When it's all well, everyone takes it for granted. That is also what makes it ironically vulnerable. Like a team carrying a load, one by one conveniently "relieves" themselves of the duty of sharing the load, with the confidence the others will help carry theirs. Instead of voicing out early and amicably, the ones left bearing the load and grudge without understanding why the others had to relieve their duties. The ones who left takes for granted their load is well handled and doesn't make the effort for their speedy returns. While the ones carrying the load eventually burst into angst and hatred, when in the first place their overloaded bodies were not made aware to their teammates.
Then everything breaks down. Tension eruptions. The load is split but with it added the burden of hurt emotions.
Harsh exchanges are made. Relationships held by no more than a over-stretched band. There but useless. In fact more of an eyesore. Yet no one can just throw it out. It's just worn out.