Complaints about "judicial activism", or complaining about "judges that go to far, have been blasted everywhere since the at least the 90s so more than my adult life, at least from what I can remember growing up in the middle of the USA.

Hence the cases and controversies clause.

Except judges can't do anything proactively and are forced to rely on the executive to enforce their decisions and the legislative to fund them. Really, they're absolutely nothing like a monarch. Especially compared to the guy who appoints all the secretaries, commands the military, and decides foreign policy.