>>64132654I think the post you replied to is a good guess for why her chat is so low energy.
Since you mentioned Filian, it's worth noting that Filian is a zoomer with content mainly dedicated to zoomers, her streams are more high energy. Hell, in that livestream you linked, some of her chatters hopped to Henya's stream to get her to play Suika with Filian, so she's more loose with how she moderates her chat.
Ironmouse is more low energy, she streams long hours, her mods run her chat like North Korea and since she's been streaming for a longer amount of time, I'm not surprised if some people are just happy with being lurkers, who either watch the stream and not chat or put it in another tab and listen to her while they do their shit.
At the end of the day, I do believe that it all goes back to chat culture and how a streamer, their content and it's mods mold their chat.
Since you are doing comparisons, have you tried comparing her to Zentreya or Geega? Both of them are highly interactive with chat, so maybe the different content and culture of those two could result in more chat interaction.