The description labels in the General pane are inconsistent regarding to the use of periods about switchboard-plug-mouse-touchpad HOT 3 CLOSED

From a glance at other plugs like Sound, Display, and Notifications, we more often use periods with this sort of text. I think normally we would avoid periods for stand-alone help text, though (unless it's multiple sentences). If that's what @elementary/ux wants, we can do so here and then visit the other plugs and fix them as well.

from switchboard-plug-mouse-touchpad.

To clarify this (and maybe I can propose this to the HIG): single sentences in the UI should likely not use punctuation because it's not necessary. Material Design seems to agree with this: https://material.io/design/communication/writing.html#principles

The exception is with multi-sentence labels or labels that are shown in the same context/alongside multi-sentence labels for consistency.

from switchboard-plug-mouse-touchpad.

macOS’ HIG describes it like this: if it’s a sentence fragment, don’t use terminating punctuation; if it is, use it.

from switchboard-plug-mouse-touchpad.