I have a quick question about buttons that toggle between two states. (Think Play/Pause, or Shuffle/Regular Play.) As the title says, should the toggle show it's current state or the state to which...
Not if the globe has blown out, in which case you need the switch to indicate which state it is in (unless you like to live dangerously and change globes in lights that may be still on :-) ).
Exactly. A light switch* shows its current state, and toggle buttons are effectively an equivalent to that.
*Standard, two-way garden variety light switch
I’d argue that a light switch has an indicator that shows the current state, separate from the switch.
Not if the globe has blown out, in which case you need the switch to indicate which state it is in (unless you like to live dangerously and change globes in lights that may be still on :-) ).
In my experience only kinda, and by convention (up is on), and three-way switches break this (indicator becomes the light itself).