That is by design, no? Sherman act does not address a lot of modern anti-trust, as you mentioned. We need new legislation.
Judges can just as easily find pet causes that don’t align with your interests, I don’t think that’s the mechanism you or I want our country to rely on.
All three of the main US federal antitrust laws (Sherman Act, Clayton Act, and FTC Act) have neen amended since originally adopted, and the FTC act also creates regulatory authority which the FTC has regularly exercised. Even ignoring case law evolution, US antitrust law hasn't been static.
Judges can just as easily find pet causes that don’t align with your interests, I don’t think that’s the mechanism you or I want our country to rely on.