The idea is quite simple, really: the very act of observation changes the thing that you are about to observe. When you connect an irate CRO to a perfectly correct circuit, you are in fact making that circuit incorrect. The only way to compensate is to make the circuit incorrect in the first place. Since grad students are taught to go for the answer first, their contraptions (which have these elaborate work-arounds) won’t actually work “in real life”. Scenario: “Damn, this reads well alright, but it breaks my radio!”
Solution, improve the curriculum, or better: buy a new, working, CRO.