Is it always best practice to wrap a mc and Flasheff component into another mc?

Hi,
If it is always best practice to wrap a mc and Flasheff component into another mc...(i.e select them and create new symbol)?
please explain the performance benefits...does it run smoother for example...I know it eliminates errors...

It will not run any smoother it will just make your .fla file look more organized and of course that error is removed. But if you do not have many FlashEff instances in your .fla creating a new MC and wrapping the FlashEff and the target in the new created mc is not a requirement.