I feel like D3 ought to be the for-computer substrate for libraries that are actually for humans.

I suppose it matters less now in the LLM age.

If your LLM is the only one that can reasonably maintain your software, you essentially created a new kind of lock-in, similar to what we already solved with open source a long, long time ago.

Once your LLM gets too expensive, goes out of business, and the competitors just don't quite do it the way your favorite LLM does it, you have a problem.