They make it easy, and then human nature and dev laziness does the rest. If you can reach across the repo and import any random piece of code, you end up with d

They make it easy, and then human nature and dev laziness does the rest. If you can reach across the repo and import any random piece of code, you end up with devs doing just that. It's a huge huge pain to try to untangle later. That's why tools like Bazel are strict about visibility and put more friction and explicitness on those sorts of things. But this tends to not be the first thing at the top of people's minds when starting a new project... so in the monorepos I've worked on, it's never been noticed until it's too late to easily fix.