This means it has to handle basically all business tasks, so "arbitrary". I'm not sure what percent you have in mind by "many many many" but I would say it can't code half the things you need in an efficient and minimally buggy way.
Even IF they need code, they need at best a CRUD app to track patients, that's it. There is no way Fable or Opus 5.5 can't one-shot a village vet clinic app in 30 minutes, and only with "I need a village vet clinic app" as a prompt, and whatever questions it decides to ask along the way with it's "ask user" tool.
Or a florist, to use the example from a sibling comment.
Code is tiny part of "business".
Automated diagnostics, pharmacist, surgical robot, something to express anal glands without harming the patient.
Dog-English machine translation.
I did support for around 15 independent vet clinics in the past.
And that one shot app is not going to be bug free.