Because the stubborn morons in charge are enamored with his success last year and don't want to admit he's not good. Haseley should've been up here a long time ago - he's also probably not very good but at least he can kind of play defense and walk a little.
Menechino's approach is PERFECT for this. Turn Gallo into an opposite field singles hitter!
But seriously if anyone is gonna do well with an oppo approach it's an 80 raw power guy.
They also spend a TON on drafting, international signings and player development. If the White Sox had a $190m payroll AND poached some drafting and development talent from SF, Cleveland, Tampa, NYY, LA, etc. they'd be in a way better spot.