First of all, I do not think this is a duplicate of Which answer do I accept if I have multiple correct answers?. This question was about several answers that referred to the same question.
If I ask several questions or a question containing different parts, what should I do if different answers refer to different questions?
Consider a question about a math task that consists of two subtasks. IMHO there is no sense in creating two different posts for each subtask, if they are directly related. So what do I do if person A answers the first, and person B answers the second subtask in a separate question?
Of course I could (and should) upvote both of them, but I really think that awarding only one answer by accepting it isn't fair to the people who spent their time trying to help me.
This is why I would vote for a new feature that allows accepting more than one answer, if the provided answers are equitable.