And well... it isn't. The biggest thing I can tell is that it's "hip". Meanwhile Sublime Text spins around it at 40MPH doing donuts.
I tried. I really tried to use Atom. But the text editor is just so slow and unresponsive, and that is a flat out dealbreaker for a text editor. Its extensibility isn't any better than Sublime's, and I feel like Python's a way better language than Javascript, so I'm happier tooling against Sublime.
I too wish Sublime Text was open source, coming from an open source development background, but I understand exactly how hard it is to develop open source software and feed and clothe yourself - people only buy "support contracts" for the first year and rarely renew, and only for software they feel is technically complex enough that they might actually need help or customizations.
For the record, I also backed GNOME Builder (which I also already find superior to Atom) in the hopes of some day it becoming the text editor and development environment I lust after. But my greatest fear is that more time will be spent on the shiny features and not enough time on the things I really care about like a decent GUI debugger so I don't have to live with poking at GDB, ahead-of-build compiler warnings/errors, and code refactoring tools.
Compared to Sublime, Atom developers can build much richer interfaces.
my own supercollider IDE in Atom:
https://atom.io/packages/supercollider
this is a full repl with a debugging call stack
haskell IDE:
https://atom.io/packages/ide-haskell
preview your development work in a web pane:
https://atom.io/packages/mobile-preview
but yet I think the packages are still young and there is much more that can be done. its early days.
ST3: Instantanous, VS2013: 1 second, Atom: 3 seconds
You know you've got problems when Visual Studio is running rings around you.
- it's hip (dont discount that, its important. it excites people, and gives contributors a reaso to contribute)
- it's in JS - maybe not right for you, but there are lots of people who have the opposite opinion.
- it's open source: for some, a closed source editor is a deal breaker. Imagine the people who say "i hate emacs and vim; I'd love to use sublime but it's closed source" - they'll run to atom.
- its got corporate backing (gnome builder may die or wither, there are many who can believe that atom wont because of GitHub's backing)
So those are some pretty big niches right there!
http://www.sublimetext.com/forum/viewtopic.php?f=2&t=17509
The product is alive but understandably slow with a single developer.
The editor is intentionally crippled.
I'm the author of the Zeus editor and I regularly use an old 1.25 Pentium with 512 MBytes of RAM to test the performance of the editor.
Even running on that 15 year old machine Zeus stays fully responsive while editing a 60+ MByte file.
For a modern day tool a 2 Mega file limit seems rather low.
I'm guessing that Zeus isn't based on a web browser but was designed from the beginning to be an editor.
But Atom was also supposed to be an editor...
So it too is limited by the total memory available to the application.
For a 32 bit Windows application the available memory comes in at around 2 Gigs and for a 64 bit Windows application that explodes to 8 Terra bytes.
So even if Atom was 32 bit it should have 2 Gigs of memory to play with.
I'm not sure why Atom does limit files to 2 megs, but if it is because of the expansion of memory then there must be some serious expanding happening there.
That will gain it enough traction to prove itself in the market, and over the next few years it will fix all the problems such as the 2MB limit, and whatever else is there. And then, laggards (well, you're probably more of an "early majority" type of person in Crossing the Chasm lingo) will see enough value to join.