Useful and useless (or good and “less good”) aren’t easily mapped to big and small.

From a purely UX perspective, showing a red badge seems you’re conflating “less good” with size. Who is the target for this? Lots of useful codebases are large.

I do agree, however, that there’s value in splitting up domains into something a human can easily learn and keep in their head after, say, a few days of being deeply entrenched. Tokens could actually be a good proxy for this.