We agree on this point. SCOTUS is adept at evading its duty.
The inevitable question is how could Brandeis and SCOTUS suddenly introduce the Standing doctrine and justify doing so, whether for the excuse to implement a separation of powers of the three government branches or otherwise, in 1922 after there had been no such doctrine during the prior 133 years of SCOTUS deliberations and history of the Republic? It may be argued that the application of the Standing doctrine is injecting SCOTUS into political interference with the separation of powers by usurping the power to discriminate between which Controversies it will and will not adjudicate for the benefit of a party to the controversy.
The neglect of their sworn duty under oath suggests this circumstance is yet another reason why a future Congress needs to set an example and impeach some Supreme Court Justices for their role in in such High crimes. The Senate and Senators need to have their wings clipped by repealing the 17th Amendment and by making it easier to remove and/or recall a Senator for failure to comply with the oath of office or failure to faithfully represent the constituency.