[adewinter]

I generally agree with your sentiment but do also think there is value in some degree of flexibility and recognizing some plans have more significance than other.

E.g. if the friend bailed on a coffee break instead of a weeks-in-advance-vacation-plan it would be much less of a big deal (maybe not even worth nuking the friendship over?). Either way, situations like that do call for evaluating how important that person is in your life and (down)ranking them accordingly. Everyone has some fair-weather friends.

[anarticle]

There's flexibility and then there are repeat offenders. In a more detailed look, last minute cancel is the worst.

I have moved the fair weather friends to group invites, and they either come or don't. They torpedo so many plans, it's not worth making the changes anymore.