I've always wondered why e6 uses WebM instead of MP4 for video files on the site. MP4 is a format which has higher compatibility with devices than WebM, additionally source videos are more often than not MP4s, which require conversion to upload here and thus potentially cause a loss of quality. Additionally, other boorus I've seen use MP4 for videos as well.
Is there some kind of reason, technical or otherwise, for using WebM?