Call me old, but I don't understand the need for so many pitchers. Way back when in the Dark Ages i.e. the late 60s, the Twins basically got along fine with 10-11 pitchers with as few as 9 throwing pratically all the innings. I don't ever recall them having more than 10 pitchers on the roster other than after the September call ups. In 1967 Twins pitchers had 58 complete games and 4 pitchers with over 200 innings--and this was without the designated hitter. (There were also three position players who played at least 160 games). In 1969 the Twins got 46 complete games from their pitchers. Closers routinely pitched more than one inning on consecutive days. Even in 1987 and 1991 the staff pretty much consisted of 9 or 10 pitchers with a few extra innings thrown in here and there from retreads and call ups.
With all the supposed improvements in sports medicine, computer analysis, better training techniques etc, you would think today's pitchers would simply outclass those of 20-30-40-years ago, at least in terms of physical conditioning, yet from what I can tell, with very few exceptions, they don't. Injuries are common and managers are, in my opinion, way too hung up lefty-lefty, righty-righty matchups.
If a team can't get along with 11 pitchers it seems to me something is seriously wrong in several different areas.
I rather have those extra pinch runners and pinch hitters.
My two cents worth.