Darius apprehend slow

I feel like this 40% slow is kinda worthless compared to 90% slow from W. Yeah during lane phase it might be used for opportunity to hit opponent once more without aa resert. But honestly during teamfight this thing just feels useless. Firsf of all for more interesting spell learning order you can move his armor penetration passive from E to W. So people would chose between whats more important for them - fight kite champs/get some armor penetration

How about to replace this 40% slow with grounded effect for 1 second? It looks more useful for the team and satisfying to hit it. If you think this thing looks way too strong we can make this ability working like that only if you have Bloodrage passive activated.

I'm just confused how much niche and dumb champ (solo queue lane abuser) Darius can be without any options in build path/spell ordering.