I apologize for my ignorance in asking this question but is Emacs considered an IDE? I thought that was a term reserved for large, graphical editors like IntelliJ, Eclipse, or Visual Studio.
Emacs standing alone on a Linux Kernel
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That joke was dumb from the beginning and has fallen into complete irrelevance years ago - Emacs actually can and does vim better than Vim, GVim, and Neovim, or any vim plugins for other IDEs. I'm saying this with a confidence of a die-hard, experienced vimmer.
I can start extending it on every possible dimension without even having to write any code into a file - I can open a scratch buffer, write some Elisp and evaluate it in-place.
What else can provide a complete environment where one can code, debug, manage version control, read documentation, run terminals, manage projects (I search through Jira in Emacs), and even handle email or browse the web without ever leaving the editor? I'm reading this thread and typing this comment in Emacs, btw.
While modern "IDE"s like IntelliJ or VS Code offer polished, pre-configured experiences for specific languages, Emacs takes integration to a philosophical level where everything shares the same keybindings, configuration language, and conceptual model, making it less of an application that integrates other tools and more of a platform where all tools become native citizens of a unified computing environment.
I'm not sure there is a rigid enough definition of IDE to say whether Emacs qualifies or not. I think it does by virtue of its extensibility, but I could definitely see a legit argument that it's merely an editor because it doesn't have a lot of the tooling of something more modern. I think what you consider to be an IDE (IntelliJ, VS, etc) is something that didn't exist until modern GUIs. Prior to that, terminal based things like Emacs (or LSE on VMS) were the closest analog.
Not only that - it supports PDFs (I annotate the books and papers in it), SVGs, variable fonts, emojis, even spreadsheets - yup, you can do Excel-like calculations; there are built-in browsers, etc. Besides, you can control music and video playback - useful when watching videos and taking notes, you can extract video transcripts, etc. etc. There even exists (albeit quite primitive) a video editor for Emacs.
Define "more modern"? Language servers, Git integration, refactoring tools, debugging? Emacs has all of those. Sure, VSCode and IntelliJ give you this stuff out of the box, but they can't match Emacs features like editing the same file in multiple ways at once (indirect buffers), instantly checking what any key does, or changing any behavior on the spot. What looks "outdated" about Emacs is actually its openness - while other IDEs hide everything behind pretty buttons, Emacs lets you see and change how everything works. You actually own your tools instead of just using them. In that way, Emacs isn't just modern - it's timeless.
Honestly, the big barrier to entry for Emacs is finding the time to configure it to your liking. The best way is to use it along with your IDE and existing tooling, slowly integrating Emacs into your workflow piece by piece and tinkering with it when you have a bit of time but always with a goal in mind i.e. window (pane in modern vernacular) management, showing symbol documentation in a hoverbox, adding spell checking to comments or inline git blame.
And sure, there are lots of bits that you need to get used to at first, how copy and paste works out of the box without CUA-mode for one, but they're that big of a deal after a short while as some people make them out to be.
I'll say this though, Emacs is like tiling window management, you either love it and extol its virtues everywhere or you look at its proponents like aliens from another galaxy.
(Among other things)
By which I mean you can make your IDE with it, but it's not an out of the box thing, and it'll be bespoke and unique for you.
With LSP and treemacs and company mode, it's a pretty decent IDE. It just requires you to get all the pieces set up the way you want.
Where IDEs impose hierarchical workflows, Emacs says 'no gods, no masters, only defun' It's not a cathedral or a bazaar - it's an infinite commune where every buffer is a consensus decision you make with yourself.
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¹ - Peter Kropotkin was a Russian aristocrat who said "fuck nobility" and became one of anarchism's main theorists.
So if you want it to be, yes and with a lot of support out of the box these days.