A client books a ninety-minute appointment, doesn't show, and doesn't pay. That's ninety minutes you could have given someone on your waitlist, gone. No card on file means no recourse.
Your booking lives in one app, your client notes in another, and the actual conversation is somewhere in your DMs, your texts, and a screenshot you took of a screenshot. When a regular comes back after six months, you're rebuilding their history from memory.
You spend your evenings confirming, reminding, and asking people for money they already owe. The work you're good at takes up half your day. The admin takes the rest.