I'm 100% certain I'm not. In previous versions, the bluetooth icon would change to look like this when headphones were connected:
View attachment 1668689
In Big Sur, there's no glanceable indicator that my headphones are connected, or at least not that I've found so far. I'd love to be wrong though, so if you can direct me to whatever setting I need to toggle I'd greatly appreciate it.
EDIT:
Just to be clear on what I'm talking about, I've made this to hopefully better illustrate what I mean:
View attachment 1668704