Have you ever worked in a monorepo? With at least 5 apps and at least 5 packages, each with direct dependencies, devDependencies and testing libraries? The amount of packages you’ll need to download for a full dev environment can get really big really quickly, even if your end-user bundle doesn’t have many dependencies at all. I’ve worked on projects where an npm install took five minutes and a bun install took 10 seconds. In the real world this makes a big difference.