I'm glad Muzan finally got rid of them all, that fight was extremely boring. It was about to get extra dumb with everyone suddenly getting a new powerup once again. Wow whatdya know, I can see through him too just by trying a little.
Yoriichi is an important plot point of the story, why would you complain about the development when we've been getting plenty action as it is. The fights already drag on, the fight ended, this isn't filler.
First the mark, now the vision. No technique is special now since anyone can learn everything mid battle just by 'trying', for the sake of plot armor. Seems like laziness to me. I love this manga but everything feels so rushed.