Short summary: Is it acceptable to edit a question, so that it differs from what OP originally asked with the purpose of getting a presumably off-topic question on-topic? Especially, when there are already answers to the original question?
A few days ago, a question was asked: 'How much should I tip in restaurants in Germany?'. The question was originally closed as a duplicate of Is tipping mandatory at Restaurants and Bars in Germany? since many of the answers to that question also go into discussions around how much to tip. It was later reopened, since the question itself is not a duplicate, but I chose to spend another close vote. The question is IMHO primarly opinion based. I have been living in Germany for about 25 years now, have for a while worked on the 'receiving end' of tips and there simply is no expected tip amount in Germany. Customers tip what they feel like and even not tipping is not necessarily a hidden complaint about poor service.
Obviously as an attempt to get the question on-topic again, the question was edited to now ask 'How much do people tip in restaurants in Germany?' after two answers had already tried to go into the original question. OP even answered his question himself with a list of examples what he feels right to tip. Since OP answered the actual question himself, I doubt that we can here assume that he ment to ask something different.
In the help center, there are examples of 'when to edit', but nothing directly mentioned about what not to do when editing. One of the points is however:
- To clarify the meaning of the post (without changing that meaning)
Even without it being mentioned in the help center, my gut feeling tells me that it should be considered bad conduct to edit and change the meaning of a question, especially in this case, where the original question had already been answered. I suggested to David Richerby, who edited the question, that even if he is trying to get the question on-topic with the edit, it might be better to let the original question be closed as off-topic if it should happen to be so, and rather ask the other question in a new post.
How much do people tip? Can IMHO only be answered with numbers from surveys or statistics.
How much should people tip? Can IMHO only be answered with 'whatever you feel the service was worth more than what's already at the bill'. Noone is in Germany expected to tip a certain amount only because it is mathematically possible to calculate the average tip you might get as an answer to the previous question. I find this obviously opinion based.