It's because of the music mod. I've (video editor) made a music mod for Strive before, and getting the volume right is difficult. Each character theme slot has a different modifier for how loud the song will be, so you have to test it and work a lot to make it not be too loud like this - Tirq
I can understand maybe there is some high level technique I dont understand that could make Sol harder to master than Jack-o but I cannot fathom how he could possibly be easier to learn
Japan is basically carrying SF6. Sf6 always retains a higher viewer count in twitch. But what surprised me the most is that all the streamers and there viewers are Japanese. Didn't even see one person in chat writing anything in English. In terms of popularity outside of Japan, I think Tekken is still unbeatable cuz nobody plays Tekken in Japan. Sf6 is basically the LOL of Japan.