I think that if a lot of the anti-subwoofer crowd let a professional home theater calibrator come into their room with some subwoofers, a good means of filtering the bass below 80hz out of the mains, and a couple of days to make it all work - they would be amazed by the results.
You unwittingly made the case for those of us who advised to "proceed with caution" when it comes to subwoofers.
You pointed out that: 1) you will likely need more than one subwoofer, 2) you will have to add an active filter to your system, 3) you will want a professional involved, and 4) it even may take the professional several days to get satisfactory results.
That certainly explains why there are so many poor sounding examples of subbed systems out there.
I'm not a home theatre person (in fact I often don't care for the over-done sound in commercial theatres) and have near zero interest in action films and the like. It's not that I and a lot of the others are "anti-subwoofer" as much as we recognize that it is often difficult to do right. And, done wrong, it takes a system backward instead of forward in other areas where our hearing is more sensitive.
I'd also be rather cautious as to whether a "professional home theatre calibrator" is listening for the same things this two-channel guy wants from his system for music. Maybe what I need is a "professional two channel subwoofer calibrator" but that strikes me as a rather rare sub-specialty. ;-)