It's true.
You're questioning the logic, though? Like 'why on earth would anyone consider Arteta (or A:another) over Ancelotti?'
And yet Chelsea, Arsenal, Liverpool and Man United have all shunned the more experienced manager, more successful managers for younger, less experienced managers who'd won comparatively very little. Chelsea are clearly building something under Lampard. Arsenal have started well under Arteta. Ancelotti said the other day that Liverpool chose Klopp after interviewing him, and Liverpool did well under Rodgers before him too. Woodward is poisonous and all is not well at United but Solskjaer is 2 games from Wembley and could yet get them top 4 this year. These are nowhere near the pedigree that Ancelotti has, yet they've worked / are working to a degree, very well.
Now it could be that Ancelotti trumps the lot of them, stays here for years and builds an empire with us, and I end up with egg on my face, I certainly hope that's the case. But, in my opinion, it's not really all that daft to say 'Ancelotti is a hell of a manager, but I've got my reservations'. It doesn't mean you want him out, it doesn't mean you think Moyes, Arteta or whatever are better managers, it doesn't mean you're not happy with the appointment. It's entirely about 'the best fit' - and I happen to think there were coaches who would have better fit us than Ancelotti at this particular stage in our development as a Football club.
Just as the Arsenal board did.