I absolutely agree, it is not in dragon's nature to be together. Some dragons do get along very well & always will, there are have been examples of that on this site; but for the most part dragons are solitary creatures, they don't want other dragons in their territory. In my case, my males have no choice but to see each other when they are out of their tank (singly, of course) because of limit of space. They are never outside together, as that causes a fight right away. But they are used to each other, as I've had them for about 2-5 years. I also have a TV going in the living room, and a ramp that they can run up & down; they have access to the whole living room, which is blocked off & access to sun on the balcony, which is also beardie-proofed. This works for my crew, may not work for someone else. When I'm at work, they're in their tanks, only Leo can see the TV from his tank, but they can all hear it. That's for the 4 that are in the living room/dining room. My 5th dragon is in my room, I put music on that TV, as he enjoys it & it calms him down. He has no access to being out of his tank, he's a rescue & needs recourperation time. He's small enough to have alot of room in his tank for him to get around, so that works for me. He's got parasites, on meds, so is in the bedroom until he's clear.
I am totally against co-habitation, even though I do know owners that have females in large tanks with double basking arears & double hides. That's working very well, but I think it's because one of the females is very different from most.
There are others on this thread that have proven, even as babies, that they can't be together at all. So I prefer not to take any chances & each dragon in my house has his own tank. It's just better that way & stops any fighting, as they will fight each other.