Right now I tend to not use an external library unless the code would be large e.g. http server and/or the library is extremely popular.

Otherwise, writing it myself is much better. It's more customizable and often much smaller in size. This is because the library has to generalize, and it comes with bloats.

Using AI to help write is great because I should understand that anyway whether AI writes it or not or whether it's in an external library.

One example recently is that I built a virtual list myself. The code is much smaller and simpler compared to other popular libraries. But of course it's not as generalizable.