The mighty docs:
Accepting an answer is not meant to be a definitive and final
statement indicating that the question has now been answered
perfectly. It simply means that the author received an answer that
worked for them personally. Not every user comes back to accept an
answer, and of those who do, they might not change the accepted answer
even if a newer, better answer comes along later.
Often, accepting an answer corresponds to reputation gains.
If you accept:
someone else's answer: You gain +2 reputation and the author of the
accepted answer earns +15 reputation.
your own answer: No reputation
is awarded, and the answer does not float to the top of the list. You
must wait 48 hours to accept your own answer.
Based on this, I do not see much of a priority in nudging users to accept an answer, although from a psychological perspective, IMO, I feel more confident when I see an accepted answer vs an unaccepted answer, especially if I am a newcomer to a topic.