For single node sure, but the moment you have some set of jobs requiring a multi node setup, the chance of wanting to find yourself in a situation where the cluster has essentially bricked itself due to a momentary power outage reduces to zero really quickly.
The only place etcd might not pay off is in disposable dev environments or something, but do you really want your prod setup to page only to discover a complete cluster rebuild is necessary to resolve the problem?
The only place etcd might not pay off is in disposable dev environments or something, but do you really want your prod setup to page only to discover a complete cluster rebuild is necessary to resolve the problem?