Self hosted analytics
The worst part about self hosting stuff is not having that seamless transition between applications built by google, microsoft and others, to being able to control the data your self. My biggest annoyance was being able to see how many hits my page got, where people came to my site from, as well as what people were searching for. This allows me to know what people like (for example most people came to my site to see me use s3 with jellyfin and nginx reverse proxy) so I can write more posts for them ...