A very snarky answer would be "Actually, almost all amateur radio operators have homes", because BNC connectors are pretty common in that world, and there are over 700,000 "hams" in the US alone. But I think I get it.
This is an engineering question, mostly, and I can give you a mostly engineering answer. I could dig into past issues of Popular Electronics and find articles from, say, 1953 and 1964 on how people are using BNC connectors, but maybe we don't need to do that to answer your question. And if it should have been posted to r/electronics or a similar forum, the mods can shake their fingers at you and nuke this, and I won't sulk.
Electrical connectors are a pretty interesting engineering challenge. They have to fit an electrical need: containing and handling voltage, current, and sometimes high, sometimes very high frequencies without leakage. They are mechanical, have to be durable, sometimes weatherproof. They have to be removable. They are also the interface between something rigid and solid ( the radio, the battery, the solar cell array) and something flexible- a wire or cable- and so create what's called a stress notch (Yank back and forth on that microphone cable over dozens of concert gigs, and the copper strand wire inside will typically start to break right where it goes into the XLR plug because that's where all the stress concentrates. Which is why sound techs will replace or repair mc and other cables on a regular basis). Lastly , they cost money, so small simpler ones are cheaper usually than big, more complex ones. So, there are lots and lots of connectors to choose from. Wander onto the site of a bigger components outlet, like Digi-Key, and you can find thousands and thousands for many applications.
What are the applications you find in a home? There are the easily-removeable connectors for handling medium-voltage low -frequency AC current needs: wall sockets and cables like the standard C13 power cord on your computer, with three conductors. There are easily removeable peripheral cables for low voltage computer devices like speakerphones and less easily removeable ones for things like monitors, with several conductors. There are low-frequency low-current audio connectors for your stereo and higher-current ones for the speaker system. And there are high frequency low-voltage connectors for the TV.
Of all of these applications, the BNC connector only fits the last. It does not handle enough current to power the refrigerator. It only has two conductors, so it can't replace PC peripheral USB cables . It's somewhat complex, so more expensive than the many RCA low-frequency audio connectors on the stereo ( though, truth be told, those can actually be pretty un-leaky of high frequency signals). Really, where it's useful is for radio frequency low current signals- the TV.
Right now, the connectors for that are screw-on ones, for RG-6 or RG-11 cable. Why not BNC? BNC connectors handle radio frequencies well. Though they lock the cable into the device securely, they can also be quickly unlocked and removed. This ability to securely lock but be quickly removeable was quite early a military requirement, as could be inferred from anything that has a "bayonet lock". The first handheld radio- the AN/PRC-6 - had these kinds of locks, and they are found on all sorts of connectors for military communications equipment. So, it should not be surprising that the BNC was first a military thing.
Why not for houses, if for troops? For decades, until cable TV became a thing, any cable coming into the TV was coming off an antenna outside the house. First was a wide-spaced double connector cable that went to screw terminals, then there was coax. For coax, those F, or RG-6, screw on connectors were and are cheap, easy to seal, and didn't pull apart, and they didn't need to come apart- the cable would end at the TV and stay there, typically until the TV needed to be replaced. Even after the antennas were being replaced by cable TV, those coax cables styed put. BNC connectors are designed to be quickly removeable- but that's not needed. They are also more expensive ( peruse military spec bayonet-lock connectors and the prices can be pretty stiff) . So, engineers/designers of TV's, VCR's, etc. could logically say, why bother using BNC?
For a guy with an oscilloscope, having BNC connectors on the probes makes great sense- they need to be un-leaky, secure, but quickly removeable. We could get into why every home needs an oscilloscope.....but maybe not here.
TL:DR The RCA and RG-6 ( or F) connectors are cheaper and work just fine for home applications where secure connections don't need to be easily unlocked, and temporary connections don't need to be locked.