I don't see what the case is for exploitation of removal of the 2-diff rule is.
If you do not want to see stupid single-diff R3 music box ringtone size sets in ranked, then the solution isn't to outlaw them - it's to encourage the BNs and QATs who actually have the privilege and right to decide whether they get to ranked or not to stop the low-effort content that adds nothing from getting into the ranked section.
We shouldn't be disallowing content we don't like, that's exactly the wrong mentality to have. This is why I somewhat agree with ZiRoX on this one - move it to guidelines - although I disagree that it should only be allowed in clearly defined niche cases.
I'm more concerned that requiring 2 diffs encourages behavior like putting no effort into a secondary diff. Not requiring diffs that are generally unnecessary and don't fill any specific purpose means less work for mappers, less detritus in the ranked section, less work for BNs checking the maps, and quite likely more good content, and a greater variety of good content. Time that is not spent, but wasted on mapping or trying to find a GD for a second difficulty required for no good reason by RC could be better spent making more maps, modding other people's maps, or even just looking for BNs to check and nominate their single diff set.
If you do not want to see stupid single-diff R3 music box ringtone size sets in ranked, then the solution isn't to outlaw them - it's to encourage the BNs and QATs who actually have the privilege and right to decide whether they get to ranked or not to stop the low-effort content that adds nothing from getting into the ranked section.
We shouldn't be disallowing content we don't like, that's exactly the wrong mentality to have. This is why I somewhat agree with ZiRoX on this one - move it to guidelines - although I disagree that it should only be allowed in clearly defined niche cases.
I'm more concerned that requiring 2 diffs encourages behavior like putting no effort into a secondary diff. Not requiring diffs that are generally unnecessary and don't fill any specific purpose means less work for mappers, less detritus in the ranked section, less work for BNs checking the maps, and quite likely more good content, and a greater variety of good content. Time that is not spent, but wasted on mapping or trying to find a GD for a second difficulty required for no good reason by RC could be better spent making more maps, modding other people's maps, or even just looking for BNs to check and nominate their single diff set.