SE is exercising in a bit of hypocrisy. On one hand, they develop these raid bosses where there is an enrage timer and by pure definition, the party has to output X damage in Y seconds in order to clear it. Yet, they forbid measuring said DPS.

I always saw SE's argument of being forbidden to parse as being similar to the concept of not being allowed to use a radar detector. These signals are out there and anyone is welcome to receive them and do what they want with them. If they don't want us to parse, then don't send us the actual damage numbers in the log. Just track the boss HP on the server and display crude percentages.