The current version of Copilot is based on GPT 3, which is even dumber than 3.5, which isn’t even in the same league as GPT 4.
GPT 3 is “fancy tab-complete”.
GPT 4 will correct your mistakes, write the test case to prevent your fallible human brain from repeating it, and then explain this in a detailed doc-comment so other humans can read it and gawk at the history of your errors.