Fun stuff on a Saturday
First, it seems to me that the title of this thread should have been: "I don't see a point in more than 1 good sub." instead of posing your opinions as a question for others to answer. Be that as it may, some simple facts:
You mentioned "... accurately reproduce...". Let's look at an example (one of thousands that exist in modern movie soundtracks with more being added every year), a scene from War Of The Worlds, chapter 9, the plane crash scene. This is a direct comparison of the digital feed from the player vs the subwoofers mic'd at the listening position:
Note that my multiple enclosure system "only" accurately reproduces the content to 3 Hz, whereas the actual content is substantial to below 1 Hz. The only subwoofer available for purchase on this planet that will accurately reproduce the low end of this scene is the Thigpen Rotary Woofer, but it can only handle up to around 20 Hz or so, which requires a multiple sub system.
IOW, if you know of a single "good" subwoofer that can "accurately" reproduce this scene, you're definitely holding out on me and it would be great if you'd share that information.
Also note that the digital capture of this scene shown above was taken from the FL/FR channels ONLY.
Also note that the requirement for lots of displacement (multiple subs vs a single 'good' one) is only a part of the equation. As I've said ad infinitum on these boards over the years; if it ain't goin' in, it ain't comin' out.
The signal that is fed to the subwoofer must first be read, decoded, processed, converted to analog, reconverted to digital, processed again, reconverted to analog and amplified. Every commercial subwoofer available today then adds further processing before the drivers, to 'protect' them from ever having even a chance to accurately reproduce scenes like the one captured and posted above.
That process from the player to the AVR to the outboard EQ to the amplifier to the driver rolls the original signal off so that it is down -15dB to -30dB or more by the time to gets anywhere near an accurate version of the original content in the bottom octaves. This is the result of circuitry built into every analog output stage of every piece of AV hardware that rolls the signal off to assure against DC offset, which causes bad things to happen. Most every one of them takes the safe route of affecting the signal with a roll off in the 5-10 Hz octave, and many even higher, making it impossible for the subwoofer (regardless of its touted prowess or size) because the subwoofer never sees the signal at all.
So, say you carefully hand pick and/or design and hand build every piece in the chain to assure a signal chain that's flat to 3 Hz (+/-) 3dB. And you search the world for an amplifier whose circuitry allows for amplification of complex signals that dwell in the underworld, where very strange things happen that don't happen >20 Hz. Excellent! You now have the potential to exist nearly alone in a unique and tiny niche. NOW you can focus on the accuracy of the reproduction of that signal containing the low end from any or all satellites and the LFE channel, all redirected to your subwoofer.
A single subwoofer will not do the job at 0dBRL at your ears. I don't care who thinks otherwise, I'm not stating my opinion on the matter, so take that FWIW.
I would also like to comment on the comparison of momentary bursts at 120dB from your subwoofer vs industrial noise exposure. OSHA, and virtually every jurisdiction in the US, define all noise statutes and guidelines with A weighting. Please search that metric and you'll see that it excludes all frequencies in the subwoofer range. That's for good reason, which you can read all about with the click of a mouse.