You're suggesting the answer by asking the question, but yes, companies that consistently deliver moderate performance (are less extractive and don't maximize gains) would generally be better for the world as a whole than highly optimized, fragile corporations that deliver maximal returns by chewing up everything in their path.

They'd even, in the longer run, be better for their own shareholders and their descendants.

BH is extremely delegated. Bufett is not in the business of managimg Fruit of the Loom for example.

But it is a holdings company, and their business model is to make returns on equity (and possibly loaning out capital to their subsidiaries) instead of directly managing their subsidiaries' operations and generating revenue.

Some sizable part of their total equity is in Apple.

Siemens also spun out so many of its divisions over the last years that I'm no longer sure what's part of Siemens anymore...

EDIT: here's a list - https://en.wikipedia.org/wiki/Siemens#Former_operations