The issue of mappers being afraid of taiko difficulties invading their maps still exists though. And while I agree that there should definitely be more Taiko diffs on the easy side, I don't think mappers, while they don't mind one Taiko difficulty on their set, want to see Taiko maps sprouting all over and making them wait more then they wish they had to. I'm not saying they have the right mindset, it's just the way things are, and I doubt it's going to change, which is unfortunate. If everyone was willing to have more than one Taiko difficulty on their set, then we wouldn't be discussing this right now.
For mappers that, like me, enjoy mapping both standard and Taiko, having a good spread in both modes isn't a big deal at all, in fact when I see my Rising In the Sun map I'm pretty proud of the difficulty spread, even though the muzukashii was mapped by lepidopodus.
You have to realize that many of the taiko difficulties on maps before the rule were guest difficulties because most of the mappers in this game do not map Taiko and thus, do not want to bother with its ranking rules. In the end, I don't think there are many more maps with a Taiko spread after the rule than before. If we disregard all the maps that were submitted before said rule and ranked today, we really miss out on a lot of Taiko difficulties.
I also disagree with people saying that those who used to make guest difficulties should start making mapsets on their own. Sure, it'd get a better spread going now that Taiko-only mapsets are allowed. However, I believe that many guest difficulties were inspired by this thought: "Oh, this map is pretty good, I like how the mapper made the standard difficulties. Hmm, but there's something missing... Oh, a Taiko difficulty! Since I map Taiko, why not make a difficulty and ask if the mapper can take it?" it's not the same kind of inspiration that one has towards starting a mapset, at least not in my opinion. When I start a mapset, it's because I like the song and want a map to go with it. If I make a guest difficulty, it's because the mapset coming with the song would benefit from it, while I don't necessarily enjoy the song. That might just be me, but that's how I work and I feel like I'm not alone.
Then of course there's the problem of mods that we keep getting back to, and mappers know this so that makes them even more reticent to accept Taiko difficulties.
peppy, I remember a discussion held in #modhelp some months ago where you said you were planning to make ranking more accessible, but reward the best maps through the charts, giving them more attention or something. I can't help but feel that there's a way to do this for Taiko too. Make mapsets with one taiko diff not unrankable, but promote the use of Taiko spread in mapsets through the charts. It will give mappers incentive to accept taiko maps, and taiko spreads, and mappers who don't want that can still have the usual one-difficulty Taiko in their mapsets. I don't think anybody loses in this situation, but when I originally expressed this thought, I got told that charts "don't work that way".