Well yes, but the point is that everything in the stdlib receives scrutiny and a long-term commitment to mainenance/upkeep. A small proportion of pypi/npm receives these things, but the vast majority is abandonware trash. You only have to briefly scroll through the main PyPI index to realise just how awful it is:

https://pypi.org/simple/ (caution— multi-megabyte html)

Lodash might, or might not, offer the same guarantees that a stdlib generally offers: backwards and forwards compatibility, a clear deprecation and removal schedule, etc.

It's great to have high quality third party libraries but stuff like most of lodash should be in a stdlib, already.

You have a point there, but if you have a very well vetted third-party library that provides things as basic as IP address parsing, you'll probably see that library included into the official library package.