There is a distinction between legal obligation and following basic norms. Save for extreme circumstances, there are not laws against being a jerk or being careless. Still people reasonably call on others not to exhibit jerk behavior or carelessness.

"With hard-won lessons of [an encompassing system]" does not give the impression that the underlying data model for changes was directly adopted. Neither does your language of "abstract idea" and "inspiration" adequately reflect the extent of borrowing.

Bonsai appears to have been, well... grafted; and it wouldn't surprise me if "Scion" was suggested by Claude specifically owing to its connotation of grafting. In any event, I imagine Claude was quite pleased with the name. To reiterate grafting in itself is no problem, but it warrants proportionate attribution, certainly so in public communication when relevant to what has been accomplished.

Attribution is a reflection of one's values. Dismissing the requests of others for attribution as "needless drama" is also a reflection of one's values, independent of agreement on facts.