priority
Priority should not be the default. Yahoo does not not what a priority is to me. I just discovered that I had been missing numerous important emails because Yahoo did not feel they were a priority, and the fact that I was only being shown "priority" emails instead of All was not obvious. The feature was not announced and was not easy to see. It also meant that a lot of emails built up in my inbox, without me even being aware of them.

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We encourage you to read at the top of the Uservoice header (forum). There we provide What’s New, Coming Soon and some Tips. There we mention how to disable Inbox Categories: All, Priority, etc. Definitely read those as we update them with useful information. Thanks.