Setting an accepted answer didn't make it into the launch release because we need the community's opinion. Here are the pros and cons:
Pros:
- Signals that the asker got a satisfactory answer.
- Pushes the accepted answer at the top.
Cons:
- Many times the accepted answer isn't what the community at large views as the top answer. For example: On Stackoverflow, many times the second answer (after the accepted one) has far more votes signaling that it worked for far more people.
- Once an answer is accepted, it might be a deterrent for other experts to add in their knowledge.
- Added complexity in the UX.
TL;DR Accepted answers might only make sense for a site like Stackoverflow where a single answer solves the problem.