As much as De Ligt's exactly the kind of talent I would like United to buy, I am also completely fine not buying De Ligt.
If he doesn't go well, Juve are saddled with the craziest contract handed to a teenager and will have a Bale/Sanchez contract for the next 5 years. Given he is a Raiola client, you can also be certain that the team atmosphere will be toxic if things don't go well.
If it does go well, Juve will be selling him to RM or Barca for 120m or so in 3 years from now. I hear you say that at least they made a profit on him then. Yes, but most of it will be eaten by the pizzaman who will probably take 30-40m of that from Juve just like he did in the Pogba situation.
Not having to deal with Raiola should just be part of our transfer policy going forward.
It doesn't mean I am advocating signing Maguire for 90m. That's exactly the kind of stupidity we have become famous for and should stay away from.