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I've not seen any discrimination regarding new or old accounts, they seem to solely upvote accounts based on the quality of the content and not on any sort of seniority system.

Musing only focuses on content  you provide..

It is not a good thing if the user answers or asks questions because of the reward.

Musing doesn't discriminate based on how long you've been on Steemit. Musing decides your post payout only based on how good your post is, and how well it answers the question asker's question.  

musing only focuses on the questions and answers and the answers that are given must also be right with the questions at the moment to help all the members who want to join the musing and want to work hard