FWIW, “colocation in component-based architecture” doesn’t necessarily mean shared code. It can just mean the one thing has all of its parts in one place, instead of having HTML in one file, CSS in another, JS in another.

You’re right about DRY and code reuse very often being a premiere (wrong) abstraction, which is usually more of a problem than a few copy/pastes, because premature wrong abstractions become entrenched and harder to displace.