There is also a catagory 6 1/2 for those who do come to the shul building but shmooz in the vestabule (with Talis & Tfillin and coffee). Not sure how much they actually ‘daven’.
I once picked up a young married man at about 7:30 IN BORO PARK who, when asked, told me that he doesn’t have time to daven in shul. I’m afraid that those like him would be a catagory #7.