It's definitely a case of tradeoffs as well... Luis Castillo or Frankie Montas may be better options, but they are also controllable for a much shorter period of time.
Using the Cards again because they seem like a really good fit (at least to me), they could value Skubal's youth and controllability over a longer period of time, especially given the size of the market that they play in, the fact that their most useful starters (Wainwright, Mikolas) are guys who are closer to the end than the beginning, and just how they have generally operated in acquiring players over the years.