Rails World 2026 Opening Keynote [video]
A keynote at Rails World 2026 argues that “agentic” AI will write most production code, enabling small teams to ship native apps and high‑performance backends—illustrated by a Rust rewrite of the HEY email service that allegedly slashed server usage. Commenters debate whether this marks the practical end of Ruby on Rails or simply a shift in where and how it’s used, with some seeing Rails as less compelling in an AI‑driven world and others still valuing its conventions for fast, safe web development. The thread also surfaces worries about code quality, security, jobs, and the politics of the speaker, alongside speculation about which languages and frameworks best fit AI‑centric workflows.
Future of Ruby on Rails
- Many interpret the keynote as signaling “the end of Ruby/Rails,” especially given the lack of Rails 9.0 news and the focus on Rust and agents.
- Others insist the talk explicitly affirmed love for Ruby and argued Rails remains well-suited to AI-assisted development, especially for greenfield web apps and MVPs.
- Some hope for a fork or “spiritual successor” if core leadership’s interest wanes.
Rust Rewrite & Performance Claims
- The email product’s backend was reportedly rewritten in Rust by agents, cutting CPU use ~99.9% and shrinking binaries to sub‑MB size, reducing servers from ~110 to ~10.
- Critics argue this is partly due to moving rendering from server to clients, so the headline gain is misleading.
- There’s skepticism about long‑term maintainability of agent‑written Rust and concern about not reading the code at all.
Agentic Development & Role of Engineers
- Keynote message: agents now write most code; humans become “makers” specifying behavior, not line‑by‑line coders.
- Supporters see this as inevitable and empowering: small teams can ship many native apps, revisit old architectural choices, and do more with less.
- Skeptics point to AI‑generated security bugs, tautological tests, and the need for human review; “blind trust” is seen as unsafe.
- Debate over whether AI boosts productivity without layoffs, versus leading to hiring freezes, role shifts, and devaluation of traditional engineering.
Best Stacks for Agents
- Many argue static, strongly typed languages (Rust, Go, Elixir/Phoenix, OCaml, Gleam, .NET) are better for agents due to correctness and tooling.
- Others say Rails still works fine with agents if you close feedback loops with tests and linters; dynamic vs static matters less to AI than to humans.
Native vs Web & Hotwire
- Keynote framed native apps as what users truly want, now viable for small teams via agents.
- Some infer this as the death of Hotwire/server‑rendered HTML; others counter that Hotwire remains valid for browser apps.
- There’s pushback on native: app‑store friction, install fatigue, privacy, and preference for the web in many use cases.
Politics, Trust, and Community Mood
- A substantial subthread attacks the keynote speaker’s recent political writings as racist/fascist; others deny this or downplay it.
- This leads to questions of whether technical claims should be trusted given alleged misuse of data in political posts.
- Attendees report the in‑person conference mood as optimistic and focused on “mending” existing systems rather than doom.