I've seen 20 or so threads like this and I've yet to see a single person that plays normals before playing ranked who has been incorrectly placed after the change to fix those seeding issues (~early feb). We've also done some comprehensive data analysis on this.
Having said that, getting ARAM and bot games players in their first ranked games is a priority for us (it's currently not considered in seeding due to how different those modes are). It is not trivial to fix this for some reasons that aren't particularly relevant, so will take us some time, but we agree it's a problem.
The unfortunate reality is that there are about as many people who are alt accounts that are trying to ego boost themselves as there are new players that go through this ARAM/bot flow, which is why we haven't changed the initial starting injection point. We could move it, but we'd just be trading one issue for another (eg. why is there a 90% winrate player stomping their way through my silve...
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