I guess I'll pop in. Auto-converts are a big problem, we all know that.
But all I want to say is that they're weighted too much. It doesn't not show any example of skill for a competitive type of gameplay.
Example 1: This is the highest weighted convert I have seen so far. There is no representation of skill, if you can memorize the literal Monotone beats in this map, then you can get quite a bit out of it. If we look at a no mod fc, it's about 550 pp.
Example 2: Quite possibly one of the hardest maps of all time, due to just actual gameplay mechanics. This is weighted a lot lower than the convert above, but the difficulty level is several times higher. If we look at a no mod score for this, its still 307 tops.
We have a bit more than 1/3 of ranked maps with Taiko difficulties involved. I don't think it would be an issue to have converts to not count at all towards pp. But to keep a little bit of competitive aspect to converts, I would like to propose converts being 1/3 of what they are now. This would stop the actual farmers and bring more attention to those that could actually play Taiko difficulties well. I don't know what you're getting at about us needing to unrank maps for us to get rid of converts. It's not the idea of converts being horrible for Taiko, it's just that having converts be weighted so much for converts is pretty harsh. I'm sure having converts weight a lot less would stop the farming, and since there's difficulty specific maps, you could possibly work around that. This type of farming in a way is relate-able to the Standard Hard farmers in ppv1, where top players were just people that could HD+DT any Hard difficulty would be in the top 100, top 10 if not that.
With the reduced weighting, you will still have players gaining a few ranks in the 5-10k+ area, maybe even the 1k area. But the top 100, 50, 10, whichever you want to pay more attention to. This is where converts shouldn't matter and being the top should show that you can play the hardest Taiko maps, not show that you can just full combo or high accuracy on a convert that has no meaning of skill besides maybe being fast, which should only be dependent on BPM. Reducing the performance that 1/8 and faster gives works as well too, since most converts use these in monotone rolls instead of complex patterns. Special keyboards could have binds so you can just roll the 4 fingers you use, which can be abused in this mode if the OD allows it. Well, there's my thoughts.