Comment by bunderbunder

I suspect that making business mistakes illegal would ultimately cause more harm than the problem such a move is trying to solve.

And I think that there's an unstated major premise behind, "what purpose did you acquire the company for?" It assumes the existing product portfolio is already in great shape and running well. Except, it's probably better to assume the opposite. Companies that are ticking along smoothly like that don't tend to be the ones that are up for sale. So usually the acquiring company's thesis needs to be something like, "we think the technology is sound but it's having problems with product/market fit that we are uniquely positioned to solve for them." And that's a thesis that directly implies changes to the existing product portfolio.