There is a good reason - in fact I asked a friend who works at CRO.
It's to explain the dining credits - it leads them to a whole 'nother spiel about "this restaurant requires one TS credit" or "this is a signature restaurant that takes two credits". You know, just like they explain "park admission is required" for restaurants inside the parks.
I wouldn't worry about it - if you get sub-par service, just ask to speak to the manager and it will be corrected. If anything, most people I speak to about the Dining Plan get great service - because while the included tip is 15%, it is based on how much you spend - and most people don't order an app, entree, and dessert for each and every person normally, so they get more food than they would have if they paid full price.
In addition, for those getting
free dining I expect the service to remain the same - maybe even better, since with free dining I have a feeling most of us will be in an even more generous mood than usual. I'll have no problem leaving an extra $5/$10 for a sit-down meal tip when 4 of us just ate $200 worth of food - for FREE.
Just go, have a good time - and enjoy the great, bargain-priced (or in some cases FREE!) food!
N.E.D.