He seems to know the codebase and works out the problem for about 30 mins sometimes fastfowarded. Then at about 28 mins copilot smashes the answer instantly when he types a method name at the bottom of a utils file. he doesn't like it though as he seems to know the api really well and wants the util to use his api instead. so deletes the copilot answer and types out a different answer using the api which he knows.

then creats a few unit tests.

This was an interesting watch and useful to see other peoples setups.

It's mediocre. Sometimes it's plain wrong, sometimes right but not exact and so on.

Was Copilot's value proposition that it gets better over time as more developers use it over a longer period?

But the value for who? Last time I checked the consensus was that using it in any project that is not for private use can get you in legal trouble. So for me it's completely useless, even if technically it could be improved with time (which may or may not happen).