My take:

I have no problem going 7K miles between oil changes using synthetic oil. It does not break down or lose viscosity.

The oil filter is another issue. It's job is to trap sediments and other crap in the oil. Lucky for us you can change the filter element without draining the oil. So I change my oil filter 3,500 miles after an oil change - and - when changing the oil. Synthetic oil may last longer - but the filter won't.

I prefer to use the fleece filter - but IMO if you change the filter every 3,500 miles - any filter will do. If you are only going to change the filter when you change the oil - well, I would not trust a paper filter in my engine that long.