Can you imagine there being no Major League hitting or pitching coaches? MLB may cease to exist, because these elite baseball players wouldn't know how to hit or pitch. Everything they'd learned and the talent they have would all be thrown out the window.
f***, can you imagine the Jays not having Cito Gaston at the helm in 92 & 93? Dave Winfield, Morris, Alomar, White, Olerud, Molitor, Stewart, Cone, Carter.....etc...etc the Jays may have been a last place club without Cito.
My thoughts are, have one Hitting Coach. He comes in learns all the players tendencies, because there's no purpose overhauling a veteran's approach. From there the coach tweaks, gives suggestion and works with the hitters on their games. Video work, scouting reports are also important. I don't see the need to have two different people doing the same job.
And if the players are so soft they feel like they need their comfort blankey of Dwayne "quota" Murphy, then maybe they need to go elsewhere.