My only wish is for doctors who have immigrated to be properly vetted before starting work in my country. Tried to get help for sudden, rather violent allergic reactions a couple of years ago. The first doctor told me to avoid fish on pizza and sent me home. The second thought it could be soda or energy drinks and did the same. Only after ending up in the ER swollen to shit did I get tested. Turns out it was neither pizza nor dr.pepper.
Service is already included. Of course it’s “ok” to not tip. You’re only helping the company avoid taxes, thus making your community worse off.