Yes! I was very happy to see this. It's simplified my configuration a little bit, but there are still some niceties I would consider as necessary in order to be productive, so I am using Mason, mason-lspconfig (automatically configure and use any lsp servers installed by mason), and Blink for fast and ergonomic autocomplete popup.

IMO Neovim OOB experience isn't quite as nice as what Eglot and completion-preview-mode do for the Emacs OOB experience, but I love that every time I check back in on the latest state of either editor, they are sensibly adding really solid functionality to the core that continuously reduces my reliance on third-party plug-ins!

Undotree functionality was recently merged in too.

What is nvim built-in diff viewer? Is it just `vimdiff` / `nvim -d`?