Nemesis Draft is more skillful than ranked.

It has exactly the same mechanics as ranked play, but with hugely added depth to the pick-ban phase. This results in much greater champ diversity and team comp diversity and thus much greater strategic depth because you now have to think about which objectives your team can actually take. This goes to show you that diversity can be achieved in regular ranked if the mechanisms were in place (added bans, stop fking making everything mobile).

There's absolutely no reason to play ranked if Nemesis Draft exists.

I haven't touched ranked since it came out. Ranked is stale, boring and skill-less compared to Nemesis Draft.