Here is a list of recent ranked mania mapsets that have diffs composed out of low skill maps. If there were no spread requirements what would have those mapsets become? I have a hard time believing they would have been maps a new player could not pass. Even less believable is that there wouldn't be a BN to nominate them.
Nao Tomori wrote:Let's take for a fact that currently, a large amount of mania mappers are unwilling to make low diffs to rank their maps. Given that they are unwilling to create low diffs even at the cost of precluding their maps from attaining ranked status, we can safely assume that no widespread change of heart will occur and those mappers will continue to not map low diffs as they aren't even needed for ranking a set.
Also something about difficulty naming. Take this mapset beatmapsets/1376799. It has an insane difficulty. Yea technically it's insane according to how RC defines it, but I wouldn't consider it "insane" relative from an experienced player's perspective. I consider this to be a low diff.
These examples contradict what you believe will happen. Mappers already create full spread of low diff maps. They are not going away.