you're boring and have no idea what you are talking about.
MF2 refers to 2 ticks of one mind flay. MFx2 would refer to 2 full casts and im pretty sure you don't realize how little of an impact openers are as a shadow priest.
getting your dots up right away isn't always a good idea because they aren't going to be fully buffed (shadow weaving) and you wont get the full benifit of the trinket procs you have (if any) my opener assures me to full duration dots buffed by my trinkets. and also depending on your warlocks they might not have their crit buff up there already. you should really think about these things before trying to find outdated spell casting guides.