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To to discover a component's value...
it's a handy tactic for us to attach a measuring circuit, then alter something while we watch for a reading to drop by 50 percent. It simplifies the calculation.
You can choose any other percentage change, but then the math gets complicated.
I agree with Brad.
Maybe also because of the 1-2-5 voltage selector of the scope.
Example: if you compare a 2.5Vpp (Ch-A) with 50% = 1.25Vpp (Ch-B)
Then turn the voltage selector for A on "1V/div" and the selector for B to "0.5V/div) so on the screen both signals appear in same hight = 2.5 div pp
It's more difficult to adjust for 70.7% or 63% or 37% ...
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