So... as a Library creator, you have to write all the network implementation, DB, image/audio/video stuff(decoding, encoding, file handling, streaming,etc) all by yourself?

If you are working in a company that makes libraries and doing this stuff on daily basis, won't you become rotten with just the legacy, OS-level knowledge, and nothing else?

are there any advantage to such opportunity in comparison to the one where you are working on a cutting edge code with the latest versions of most popular libraries ?