I think that this is a little too restrictive as part of the perfectly timed rule. There are reasons to unsnap your notes, beyond having an improperly timed map. So really I think it would be highly advised that you avoid unsnapping notes at all costs, but mappers who need to unsnap their notes for advanced situations, like off vocals or measures mapped to 16th measures it should be allowed.
This would be a good example of a guideline for that reason. There are maps that can be perfectly timed on down measures and the music plays on beats like they should, but the vocals, or certain beats may be off by so many 16ths. If the beat plays better than the nearest tick available I don't see why it wouldn't be proper to unsnap the note to make it play the best.
[Guideline] Only experienced beatmappers should unsnap notes. Most cases of unsnapped notes are the result of mapper error, and every measure should be taken to ensure that the timing is correct and the only proper course of action is to unsnap a note. Keep in mind that notes on odd measures can be awkward to play and read and should only be used if absolutely necessary.
If we have it like this, we can take unsnapped notes on a case by case basis. I'm pointing this out because some sounds just cannot be mapped with the current ruleset, and I feel that unsnapping the note is the lesser of two evils. The other rule is "Uninherited Sections must be on the downbeat". So if you have an off note, I think it would be better to unsnap the note, than to add a red line just for that part, and then fix the metronome after and that's assuming that all of the maps would use that sound. We can't omit that red line from other diffs to maintain the metronome, so unsnapping the note is the lesser of that evil as well.
This would be a good example of a guideline for that reason. There are maps that can be perfectly timed on down measures and the music plays on beats like they should, but the vocals, or certain beats may be off by so many 16ths. If the beat plays better than the nearest tick available I don't see why it wouldn't be proper to unsnap the note to make it play the best.
[Guideline] Only experienced beatmappers should unsnap notes. Most cases of unsnapped notes are the result of mapper error, and every measure should be taken to ensure that the timing is correct and the only proper course of action is to unsnap a note. Keep in mind that notes on odd measures can be awkward to play and read and should only be used if absolutely necessary.
If we have it like this, we can take unsnapped notes on a case by case basis. I'm pointing this out because some sounds just cannot be mapped with the current ruleset, and I feel that unsnapping the note is the lesser of two evils. The other rule is "Uninherited Sections must be on the downbeat". So if you have an off note, I think it would be better to unsnap the note, than to add a red line just for that part, and then fix the metronome after and that's assuming that all of the maps would use that sound. We can't omit that red line from other diffs to maintain the metronome, so unsnapping the note is the lesser of that evil as well.