We recruit two types of player. The one that will shine in his position, and the one who will hold his own, either now or after some development.
Getting it right with a high turnover of players must be a nightmare. And if you don't have enough of the former, you won't be in the top 4/top 8.
Throw injuries into the mix.
Who would want to be a premiership head coach.
Unless you cheat.