Sure, but that's specific to the fact they've made a mistake in this individual instance.
You referred to this instance specifically...Lukaku is a very good player, he wants to play every game, Chelsea couldn't guarantee that but want to keep him, so they've loaned him out. I can see it from both points of view, but if the system is to continue then we should be utilising it more.
How can Chelsea not be benefitting from loaning him out? He's taken 2 points off second place in the league this week and will take more later in the season I've no doubt. Whereas he can't play against Chelsea, so basically Everton will play everybody but Chelsea with their biggest threat available. Of course the big problem in this argument is that Everton beat Chelsea without him, which is a bit of a pisser for this argument.