I feel like this is an obvious feature. When I put a media player card that has a volume capability on my dashboard, it should have a volume slider. I currently have a work around by adding the entity right below the media player, but this is not ideal as it adds some redundant buttons (play/pause, artist information, neither of which I can seem to get rid of). It would be ideal if this workaround was not necessary.
Don’t forget to vote on your own WTH!
ope, thanks for the reminder!