It's not a question of can, it's a question of should. If any engineer on my team came to me and told me he was building a CSV reader/writer, I would seriously

It's not a question of can, it's a question of should. If any engineer on my team came to me and told me he was building a CSV reader/writer, I would seriously question his judgement as an engineer[1]. My thoughts would be that either he isn't capable of seeing obvious challenges in building a "simple" CSV feature or he isn't able to prioritize his time well, focusing on useless toys at the expense of getting important work done. 1. Of course there are exceptions to the rules: perhaps the CSV is malformed or there are special considerations in the backend, but the general point stands.