>>7580273She has flip flopped on reading EVERY single superchat because it takes a lot of time. Time that she could be focusing on making new content, behind-the-scenes hololive related things, or her life outside of hololive. Turning off superchats isn't a good option because it makes some viewers upset, but she at least doesn't feel guilt over not being able to read them.
The only VTuber who reads every single superchat these days is Kiara. Most of her content is reading superchats now, which is pretty boring for the casual fan in comparison to other content.