It's a niche for AI, which creates some great opportunities for context engineering :)

It requires you to go deep in both the code analysis and the research, which is expensive at their scale

And, as someone who's start up (EdgeBit was acquired by FOSSA recently) wrote a new JS/TS static analysis engine, it's just hard to get correct.

One would imagine they are broadly similar; but that's off the assumption that codebases are similar as well.

Migrations between versions can have big variance largely as a function of the parent codebase and not the dependency change. A simple example of this would be a supported node version bump. It's common to lose support for older node runtimes with new dependency versions, but migrating the parent codebase may require large custom efforts like changing module systems.