[Brian]

I personally use Available more frequently than I use the next action filter, for the same reasons you cite. That said, I know that there are customers who prefer to see one and only one thing they can do to move their projects forward. (Some folks struggle to decide which equally-important thing they should do first, for example.)

I wouldn't say that you're supposed to use the Available filter, but it does sound like it returns results that are more in line with what you're looking for. :-)

Re: calendars - personally, I do fine with my "due soon" set to 24 hours and with specific due date/time combos attached to the actions in OmniFocus. I don't care when I complete something in a given day, as long as it's before the deadline. Adding those actions to my calendar would just make it harder to see that I need to be at a meeting between X and Y, with another a few hours later.

Opinion on this subject varies greatly though, as several other threads on the forums will illustrate. :-)