Except for truly rare situations out of my control that prevent me from honoring my word & plans, I tend to genuinely care about people and my own integrity & trustworthiness enough to be honest & respectfully reliable about both making time to meet & relate with people ( equally so with clients, new acquaintances and long time friends ) and actually following through with doing so.
As, in addition to this consideration contributing to more harmony & respect in the world for people, this is also a direct reflection - expression of and further develops my own integrity, empathy, consideration, reliability and love.
This type of disrespectful flakiness & unreliable, disposable way of viewing & relating ( if you can call it relating ) with people is disharmonious, shallow and rude.
Especially compounded even more if people who flake get mad at people they flake on who honestly express how this is disrespectful & effects people's lives & time that we could have planned for something & someone else who is actually respectfully reliable.
I respect spontaneity and am very fluid in ways with time when there are no known prior time commitments with others.
But with balancing respect, mindfulness and integrity for honoring my expressions of interest - openness, communication & agreements with people. As this effects each others lives.
Since we do in fact live in an interconnected, relational world with each other, it does actually matter whether we and others are honest, considerate and can be trusted to reliably make and follow through with agreements, plans, etc with ourselves and equally each other.
Two relevant, respect-affirming articles from Psychology Today -