It doesn't seem possible to sort tasks by priority within the normal view of a project (and whenever I try searching this help section, I get a timeout).

I've tried using filters, but the filter dialog gives no possibility to filter or group by 'Focus' (Today, Next, Someday, etc.) - the closest is to group tasks by Start Time, but that lumps together all tasks marked Next, Someday & Waiting.

The Focus terms (Today, Next, Someday, etc.) are the very essence of GTD, so it's scarcely credible that you can't use them in filters.

It's also difficult to understand why it's impossible to sort by priority - what is the point of prioritising a task if it doesn't then appear at the top of your list?