So, I've been away from this game for years. Has there been ANY Mia content since like her route like 6 years ago?
No and there won't be, at least not for a long time, since her route is finished. Unless you're lucky and they do a little update when they migrate her route into the preview of the tech update.
hoq long the Debbie update will stop to the end it near 1 years update now update only Debbie no stop now
May was the initial preview of the tech update which had all of Jenny and Debbie's previous content migrated. July's update added most of the teacher content. September was mostly UI update.
Back at the end of September it was announced that Debbie's route rework would be the primary focus for the coming updates until her route, with pregnancy, was migrated and completed. As such, they pulled almost all of the previously migrated Debbie content so they could add it back in with new art, story, etc.
November started the focus on updating Debbie's route. January continued that. March will continue it.