Evil mode is fantastic. Not only am I fascinated by how nicely it works, I'm just impressed that it's never been a built-in feature of Emacs. It definitely doesn't feel that way. It feels like a baked-in, first-class thing.
Here's one thing about vim-navigation. Gary Bernhardt (the WAT talk guy) once said: "There's no vim-mode there's only Vim" and he was right - to a certain degree. All the different extensions and attempts to bring vim-navigation to non-vim editors have glaring deficiencies - all of them - VSCode doesn't fully vim, IntelliJ doesn't do it comprehensively, Sublime can't properly vim, etc. With one notable exception. Emacs actually vims better than vim/gvim/neovim. I'm saying this with the full-blown confidence of a die-hard vimmer.
The way Emacs implements Evil-mode and its extensions is the ultimate compliment to its design. If there's a model of a plane that can perform a vertical landing, yet never actually needs to use it, I would still love that model over any other planes, even if the feature is purely accidental. The fact that it can do so alone would be great evidence of amazing engineering. Evil-mode is absolutely one of the most celebrated achievements of Emacs, complementing other remarkable packages like Org, Magit and many others.