These are two features that have been discovered to be possible. People stopped using betterdiscord now due to it being against ToS, so why not add some long time requests?
Server video call: There's a way to do it, Go Live is a great way to have more interaction, but the next step seems to be server video calls. It'd be great to have the option to do so and have it integrated to mobile as well since the current method can only be done on PC, same as Go Live.
Themes: The option to have discord be more customizable makes it more accessible to everyone. Some people may wanna have their art as a theme, their favorite characters or even just a different color. It'd make Discord feel more homey and comfy.