But there seems to be active distrust of coders working solo, both from managers and from other coders. There's a surprisingly strong perception the "a team" is the safe option.It's been my experience that capable developers tend to appreciate other capable developers. It's also been my experience that capable developers appreciate managers who are actually doing a useful job, and vice versa, and that both of those groups are also quite willing to support those who are currently less experienced but are interested and trying to learn and grow.
I suspect the kinds of objections you're thinking of most often come from managers or developers whose own positions are threatened as soon as someone competent enters the picture. A capable one-person development group has no need of a micro-manager to take the credit on their behalf, nor of a developer who has just enough knowledge and skill to be dangerous and/or in the way but no inclination to get any better.
At some point obviously you need more than one developer for scalability and resilience, but even then you can still do a lot with a few good developers and a useful manager co-ordinating them compared to a large group of mediocre developers and a whole management hierarchy above them.