Restaurant owners’ and wine stewards’ comments

And here’s what some restaurant owners and wine stewards have said:

“Above anything, tip according to service. A lot of wait staff think that because they show up for work they should be tipped.”

” Our sommelier said that few servers and few restaurants would be surprised — or feel significantly cheated — by a tip of 10 to 15 percent on a significantly high check whose principal component is pricey wine.”

I shouldn’t expect a full 20% tip on wine — is that right?