Comment by exDM69

In Vim, the "stupid" auto complete will get 80% of the way there and works without setting up a language server and it works for any language.

By default it will give all the identifiers in all open files. Having a few of the relevant files open in the editor will get you pretty far.

I do use LSP in other environments where it is available but I still do a lot of my work with just plain vim because I jump between code bases a lot and setting up LSP for C/C++ needs some extra steps to work.