"Checkboxes" that look like little sliders usually are good UI because they avoid this confusion, "is the control showing me the current state or the option to change to the desired state?" For whatever reason, toggle switches like this better convey that they're displaying the current state before you touch them.

People do though, I often watch (and cringe as) my parents do it.

The slide is so big on this one that it looks like multiple targets. The iOS ones are small enough that the only useful interaction is to mash with fingertip.

mousedown++ but also touch events