I agree and i think that important task of projects is to manage user expectations by clearly stating what they offer. Some projects offer stability guarantees,

I agree and i think that important task of projects is to manage user expectations by clearly stating what they offer. Some projects offer stability guarantees, some projects just keep changing things. If these approaches are well-communicated, then users would be less frustrated when their expectations are not met. But truth is, i personally would not use the second class of projects unless i am desperate.