Managers like to "simplify things" for themselves. Perhaps because they hate making decisions? Most (all?) like a defined 7th, 8th, and 9th inning guy rather than a number of "options" to insert in the game. To that mix, the Twins seem wedded to a defined role for every pitcher--starter, closer, preferred set-up, other set-up guy, LOOGY, long-guy, mop-up guy, extra LHP RP, etc. Hence rather than developing pitchers they are checking boxes. Result--the Twins will sign pitchers to check the boxes this off-season rather than focusing on who might be the best pitcher.