I see all these ideas about what Thresh "should" be doing and how he has to be reworked to better fit that concept but why doesn't anybody acknowledge that he does what he is actually designed to do VERY VERY well. His hooks multi-purpose concept doesnt change the fact that, at its core, it's a 1.5 second stun. His W is a shield, his E is a knockback+slow, and his R is a Slow.
He keeps XIN, JAX, IRELIA, SHACO, KHAZIX, GAREN, DARIUS, NASUS, AKALI, KATARINA, HECARIM, LEE SIN, etc... off of YOUR lane partner, who you've been winning botlane for for the past 15 minutes.