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Does intellisense like autocomplete now work out of the box? Is company bundled in, as of recent versions? Is there any dependency on Clang to get it working for C/C++ code?

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Eglot is the built-in LSP client. You need an external server. If you do C or C++, clangd is likely what you want. Install it (apt install clangd) and enable eglot for C or C++ files in your Emacs config, (add-hook 'c-mode-hook 'eglot-ensure).

And if you are in a legacy system with no clang then?

Emacs is usually batteries included, couldn't an lsp server have been part of the package..

Then it would just have a dependency on Clang, and you couldn't use Emacs at all (since you can't use Clang).

AFAIK, the only alternative to the clangd language server is ccls: https://github.com/MaskRay/ccls

That'd increase the package disk footprint by a large value since there are many languages supported by Emacs by default.

You still need to set up an LSP server, so not exactly out-of-the-box. Something like clangd or ccls for C/C++.

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