Ha! I appreciate the compliment (I think?). To be transparent: yes, AI tools were used during development — they're fantastic for boilerplate, documentation, and exploring unfamiliar APIs.

But this wasn't "2 sessions" — Ferrite has been in development for months with ~30,000 lines of Rust across 50+ modules. The Mermaid renderer alone is ~6000 lines of layout algorithms (Sugiyama-style graph layout, sequence diagram activation tracking, nested state machines, etc.).

AI helped ALOT, but there's no "generate full app" prompt that produces working text editors with native diagram rendering, rope-based text buffers, and custom window chrome. Still takes understanding the domain.

That said, you're right that the development velocity is higher than 5 years ago. Exciting times!

It can be vibe-coded quickly but can also be done rather quickly without ai - the heavy lifting is UI lib from Zed. That is the real unlock in apps like this.