When Do You Pay the Complexity Tax? Four Bets on Immutable Linux

Submitted to DevConf.CZ 2026 in Brno, Czech Republic on June 18-19, 2026

Abstract

Every container-optimized Linux distribution solves the same problem: run containers on minimal, immutable, auto-updating infrastructure. Yet the implementations keep diverging. FCOS/bootc, Flatcar, Bottlerocket, and Talos aren’t converging toward one model - they’re making fundamentally different architectural bets.

This talk skips the feature matrix. Instead, it asks one question: when do you pay the complexity tax? The ecosystem has focused on four choices: Design time, Build time, Boot time, and Run time.

Thilo and bex together have decades of experiences at Red Hat, Amazon, Microsoft and more. Now we work with Flatcar at Microsoft. This talk shares what that vantage point has taught us about why we keep diverging, why convergence isn’t coming, and how to choose which tax your organization should pay.