Is It A Good Idea to Bring In An Outside Writer To Pen A Script For Something They've Never Part Of?

From Gail Simone penning "Between Dark and Dawn" for My Little Pony: Friendship Is Magic, and now Ariel Shepherd-Oppenheim doing the same for "A HorseShoe-in" for the first time. Some fans had somewhat mixed reactions, (mostly good),the they question is asked, "Is it a good idea to bring in an outside write to pen a script for something they've never part of?"

Especially if they're fully brought up to speed, continuity-wise.
Please feel free to give thoughts/feedback on this topical question.

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