Xin's E now does Physical damage and Scales with attack damage.

They can't really buff up the slow at early levels on his E because as soon as they did that his ganks would become insanely powerful and one could just chain his E and then pop smite once that wore off and the enemy would effectively be permaslowed and forced into a flash. Also it wasnt J4 that started that trend it was pantheon who started it. J4 only has 2 abilities that scale off AD and always has. The real real trend started with Riven. Everything Riven has scales off AD including her stun and her shield. If you want to complain about utility abilities with AD scaling then Riven should be your target.

Honestly Xin's Kit plays like an all in Melee fighter but his Kit lends him more of a tank heavy Bruiser. He has 2 AD scaling abilities His ultimate and his Q. The Q scaling is pretty much split between 3 hits and his ult is 100 percent AD plus 15 percent current health and knocks enemies away and gives Xin Armor. Honestly if they gave his E physical damage and AD scaling or hell even just AD scaling and kept the magic damage Xin would hit alot harder but not too hard to be stomping everyone. I feel like it would fix his problem of just kinda being there late game hitting things and allow him to continue to be a threat besides just the knockup guy.

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give Xin AD scalings on his W and he will be fotm in absolutely no time

Hahaha, oh God.

The scaling on his W is so absurd that AP Xin is a thing simply because of his ability to heal for 300 HP every second and a half. He's like Aatrox if Aatrox didn't blow chunks.