To offer a counterpoint, I basically entirely disagree with your opinion but maybe we have different ideas of using something.
Most libraries aren’t really that useful in the long term (although the most-used are). Typically they will not do quite what you want or they will do more than you need and therefore what you want will be mixed up with a lot of other things you need to specify. In cases where a perfect library already exists for your thing there is a reasonable chance that your thing already exists, and otherwise just use whatever language the library is in.
Now there are some libraries but I claim that basically everything else you can get away without and just do it yourself only adding things as you need them. E.g:
libc type library is quite fundamental. Likely a lot of the basic stuff already exists. So long as you have an ok ffi it should be easy to add any missing calls.
HTTP client. This is likely to exist but also not super hard to implement. One can also skip this and ffi/shell out to curl.
Json parser. Again likely to exist and quite easy to implement.
Data structures. Likely to somewhat exist although anything missing that you want may be a bit annoying to add. Typically I think most projects don’t hinge on exactly the right exotic data structure, and if they do then they should be implementing that themselves.
E.g. yaml parser. Less likely to exist and annoying to implement but you can just use some existing program to convert to json first and then easy.
E.g. bindings for your favourite C drawing library. Probably don’t exist but hopefully there is an ffi so just do it yourself.
Libraries aren’t really very special and rolling one’s own isn’t hard. And even if you refuse that, you can just write part of your project as a simple unix process and call that from your python script with all the libraries you want.
Personally I see the lack of libraries as an opportunity to not search around for libraries or try to work out how they can go wrong or be forced to do things a certain way. Especially if the language is novel, it probably isn’t really clear how such a library should be structured. E.g. the reason that rust doesn’t have a canonical gui library isn’t that there are no libraries or no one is trying or no libraries exist but rather that the community in general are still trying out different approaches trying to find something that fits the language well. On the other hand the OP mentions the existence of a widget library for V already.