Julia was my scripting and util programming language of choice for a while. But it couldn't keep me. I'm not too confident in the reasons anymore, it's been quite a while ago. I think the dynamic, unsafe aspect was a part of it, but also how it felt overall, or with code structuring?
Maybe I've been pulled away by better alternatives. (Using C# also for smaller util projects.) Recently, I've been using Nushell for scripting, which is new syntax to learn, but I've been enjoying functionality-wise.
Depends on how "separate" the plugins are.
Single config file eases configuration of a service you consider one, and extend with plugins.
If the plugins reach a certain size, or are so distinct or separate, it may be preferable have separate configs.