Before the site layout was completely changed, if we had already given out the BA (best answer), and later on someone else posted something even better, we could reassign it to the newer better answer.
I think that should still be possible, or they should just close the question, once a MHO is awarded. Maybe resolved questions could have their own section of the site.
Here's another idea: maybe the site should restrict you from being able to choose a MHO for 7 days, just to give more people a chance? I personally wait a day or two before selecting a MHO, unless someone just happens to tell me exactly what I was looking for. But that's usually questions that you normally Google, but then Google doesn't help.
Close Topics After MHO - Yes Change MHO - No There should also be an option to change the question and opinion/comment, due to possible typographical errors.
Closing the question after MHO would only stop people from giving their opinion it doesn't seem to offer any benefits! If someone really wants to add something and doesn't care that it might not be seen by the asker or in the running for bonus 'points', why not let them add it?
Allowing the MHO to be changed would cause confusion - people would see their stats go down, the asker could just flippantly change their minds, or even reassign the MHO if they decide that they don't like something the poster says later regardless of how helpful the answer was.
I think it's fine the way it is now. People should just take more time before they select a MHO to be sure it's the right one. On the old site, some people would change the BA like three or four times which is just ridiculous because then those people who were selected lose the extra points they had.
Changing MHOs sounds like it'd cause confusions, with Xpers and levels. About closing the question, I think if someone has a better advice to give, the asker should be able to see it. Yeah there is a rewarding system on GaG but I'm here to talk to people and give advices, so I'd want to help out even if I couldn't get the extra points. Overall, I think it is fine the way it is, when the asker is objective and patient.
Don't choose MH so prematurely. Give it a long time. Of course the question pops up back in the feed when you award the MHO so it will always come back into the public light. If you want to avoid getting a more helpful answer once you have got a lot in and the question dies then update it. Then once you have had a lot of answers choose your MHO and unlink the question from your profile. You won't get notified about new posts so will be blissfully unaware of any further answers and then perhaps you will be able to sleep at night.