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.
In the Usagi's Birthday Party on June 30th 2020 they didnt show a trailer of Eternal ( we already had seen a teaser of it ) but the full Moon and Chibi Moon choppy transformation. Maybe it's the same with this year and they just show the Eternal Sailor Moon transformation ( of course retraced from the 90's ) and they leave the proper trailer for September.
In fact: they shown the final trailer for Part 1 in October 2020 ( with a japanese release in January 2020 ) and the final trailer for Part 2 in January 2021 ( just one month before it's premiere ).
Yeah, those wings in the 90s anime obviously have a considerable thickness, & are also shown to be made of hard materials in that they can easily knock things down to the ground if she's not careful. lol