Yes. Another inconsistency involves the point in time at which a tip is expected. Historically tips came after the meal (or other service), and in theory you would tip well if you were happy with service, and badly or not at all if you were unhappy. In itself that made a little bit of sense (w/o considering the contradictions you mentioned).
But nowadays you're often expected to tip at beginning of meal (i.e., when you order and pay at register), and your tip is not tied to quality of service at all (and very often there isn't even any actual service, other than taking of order and preparation of food). As an older person this strikes me as bizarre; grew up in atmosphere where tips were always after meal and explicitly tied to quality of service.
But nowadays you're often expected to tip at beginning of meal (i.e., when you order and pay at register), and your tip is not tied to quality of service at all (and very often there isn't even any actual service, other than taking of order and preparation of food). As an older person this strikes me as bizarre; grew up in atmosphere where tips were always after meal and explicitly tied to quality of service.