What id like to see changed about galio

Since galio is damn near pick/ban currently with his power a lot of his problems that make him such a 'generic' tank lies most likely in his W, for a mr stacking tank having such a generalistic all purpose spell for survivability really makes his niche of being able to tank up spell based/magic damage users a lot harder to discern from his ability to tank all damage in general. So to make galio the anti spellcaster and magic based champ hes supposed to be heres what I'd do to galio

W: Shield of Durand ~~DAMAGE REDUCTION: 20 / 25 / 30 / 35 / 40% (+ 8% per 100 bonus magic resistance) ~~ Removed New: Magic damage spell reduction: 25%/30%/35%/40%/45% (+ 8% per 100 bonus magic resistance) Physical Damage spell reduction: 12.5%/15%/17.5%/20%/22.5% (+4% per 100 bonus magic resistance)

Goal would be to make galio defensive steroid better defined by being a anti caster, while also making him not completely helpless vs physical damage threats and making him much easier to be balanced in the future by removing a core aspect that makes him such a generalistic tank pick.

This change may or may not be completely gutting him but keep in mind the goal is to make him healthier down the road and better define his niche so that he doesnt get gimped as a champ because his most powerful asset to him being a tank makes him too generalistic. Yes it might be too much for the next patch, but compensation buffs can be made and I dont want to gut this champ, hes fine overall by design i'd just like to see him better defined in the most important aspect to his role as a tank/pseudo tank.

Also forgot to add that yes, this change would apply to his ult damage reduction.