The problem with the term "whataboutism" is that its users wield it to prevent discussion about anything that doesn't fit their agenda. In particular, its main use has been to amplify the Russiagate conspiracy which was never backed by any evidence and yet was the forefront of public attention for almost three years. If you pointed out actual evidence-based foreign influence such as that put forward by the Saudis, you were accused of "whataboutism". This was almost certainly a tactic dreamed up in a politically motivated D.C. think tank or PR firm, and has prevented fruitful discussion of countless real issues for an extended period of time.