currently it is possible to change text within quotes, when quoting other people´s posts. Also it is possible to create fake quotes.
this should be prevented as this could lead to cheating, misleading communication and negative sentiment.
This is a bit of an edge-case, and doing this would entail massive amounts of back-end code to verify that quotes were not altered and would also most likely mean that people would not be able to edit their quoted text. All in all, it just doesn't seem worth the effort when there are so many other things in the list to do.
Forums have worked this way since the first tyrannosaur decided to comment on something that triceratops had said. While 'it's always worked like this' is not always a justification (especially around these parts) in this case it's a case of 'ain't broke don't fix'.
Main reason I feel you should be able to edit them is for example if you want to get rid of irrelavent text to a reply, like I have done in the above quote. At the end of the day there is an arrow that take you directly to the quote so you can see the exact post.
It's a nice idea in general but it doesn't seem to be worth all the effort to make it happen really as the advantages vs time spent to code it aren't all that great. Very rarely do people edit what people have posted unless its to be funny and usually its clearly obvious it has been tampered with.
Making a point or not, having it appear as if one of the developers have said something when they did not, will not be tolerated here. It will only lead to confusion, and at some point taken for gospel.