Is the editor/IDE really the limitation? If anything web-technology-based IDEs are usually the ones wasting resources nowadays, my long-lived emacs session running the SLIME environment to interact with common lisp uses a meager (by modern standards) 110MB of RAM. I used a very similar setup 15 years ago on a computer with 512MB of RAM and a single-core 1.5GHz CPU.

You can already develop very comfortably on a chromebook if you're willing to forsake the bloat of the web. Actually if I can trust Wikipedia a modern Chromebook outperforms my main desktop machine a decade ago. Putting everything in the cloud doesn't strike me as a great step forward, although it could have its uses.

Exactly! We want to empower developers to work from anywhere and have the flexibility to choose the editor and device that makes them most productive.