How do people, most notably tradesmen, survive if they don’t do this?
The shoddiness on display from supposed professionals at times is outrageous and it seems to occur more than people think.
The dominos effect of this can be enormous. You fail to show up to the wrong person and they can spread the word, and reputation does count for a lot when you are out there doing your work.
Things do happen from time to time, that inhibit you from showing up on a day or on time but at least give the courtesy of letting your client know as soon as possible.
No sign of showing up at all, especially when you say you will is amongst many things disrespectful.
You are essentially giving your competitors far reaching advantage as well.
So when offering up your work and services to others, do it with passion and commitment, make promises you can keep and show up.