I’ve had no problems chatting and calling with people whom I have actual business with. And here I’ve had the most success with planned meetings and agendas.
My job is not to invent the next big thing.
I'm not sure how much of that is applicable to normal jobs where your employer owns your work.
Knowing this, from a company perspective, remote can work if individuals have a way to create relationships. In my experience, some people bond over work but most bond by spending time with each other doing friendly activities which are not work related.
An in-person party or a holiday is the best option but some online gaming is a decent substitute in these authoritarian times. Some people swear by virtual coffees rotations that randomly match people but I had a couple of good ones and dozens of cringy/weird. None of them ended up being positive for creating relationships, at best it was useful for knowing who is who.
So where are good ideas supposed to emerge from? I've yet to see much of that beyond technical smalltalk.
Outside of maybe a very innovative R&D department I don't really see these "brilliant ideas that only smalltalk could achieve" in your typical run of the mill company.