It absolutely inadequate to compare mahou shoujo anime to THE shounen anime. It is like comparing Black Widow to Aquaman. This is reality, I am not misogynist but men are way more into these stuff and stick to them way into adulthood. In Japan the separation of men and women shows are still a thing and as much as we are trying to stop this in the West the box office show the same result. As for Doremi - it is a much better comparison, but the movie was the first new anime for the franchise in a long time, while Eternal is the forth season of an ongoing already flawed reboot posing as a movie. I highly doubt Doremi would surpass Sailor Moon if Crystal started as a movie anniversary project. To be perfectly honest it is not all bad that Eternal underperformed as it was also underfunded . Otherwise it would encourage TOEI to keep it this way - something they actually do pretty successfully for years.