i don't really see why it would be confusing as having dashes after higher-snapped hyperdashes is unrankable in platters (so it's not like the intended player would be expecting a dash after the hyperdash)
no change
i like my way better because 1/4 dashes are fun variety and also the vocals on the red ticks (00:37:969 - 00:43:787 - 00:49:605 - ) makes the simplified rhythm feel weird
reduced SV (by tilting sliders, reducing curve strength on C-curves and by reducing walk spacing) in the slow parts starting at 00:14:900 - and 00:37:897 - ), this should add the required contrast to the map
kiai has more horizontal sliders so contrast with other parts is fine as is
i've mapped the original yo-kai disco before, and the melody has these 1/6 parts. since there is no drum on the 1/4 tick, i decided to map the 1/6 instead
no change