There's a couple of ways of handling this. First is that of course we need to create a package manager and ecosystem, and that will take time (we can accelerate it by making a great experience, but haven't gotten there yet).
Dark can talk to other HTTP things, so many of the functions that are done by libraries can be done over HTTP. So you can call other services, even if we don't have an SDK for that yet. And from there it should be easy to package it up so there is an SDK.
Finally, it's a question of what you're doing. There's many tasks where the disadvantage of not having an ecosystem is outweighed by Dark's other advantages. And as we grow the ecosystem, the disadvantages go away, unlike the status quo tooling.
Dark can talk to other HTTP things, so many of the functions that are done by libraries can be done over HTTP. So you can call other services, even if we don't have an SDK for that yet. And from there it should be easy to package it up so there is an SDK.
Finally, it's a question of what you're doing. There's many tasks where the disadvantage of not having an ecosystem is outweighed by Dark's other advantages. And as we grow the ecosystem, the disadvantages go away, unlike the status quo tooling.