Hi, Felix here - I'm responsible for said Electron app, including Claude Code Desktop and Claude Cowork.

All technology choices are about trade-offs, and while our desktop app does actually include a decent amount of Rust, Swift, and Go, but I understand the question - it comes up a lot. Why use web technologies at all? And why ship your own engine? I've written a long-form version of answers to those questions here: https://www.electronjs.org/docs/latest/why-electron

To us, Electron is just a tool. We co-maintain it with a bunch of excellent other people but we're not precious about it - we might choose something different in the future.