It appears the sliders display if the widget is wider than some minimum. It's not clear if the behaviour changes between browsers, etc.
Perhaps there's an opportunity to change the default display style system-wide. However, I suspect sliders are one of those things that are context-dependent. Luckily, the pages are editable by anyone and the slider can be displayed on pages where it makes sense.
It appears the sliders display if the widget is wider than some minimum. It's not clear if the behaviour changes between browsers, etc.
Perhaps there's an opportunity to change the default display style system-wide. However, I suspect sliders are one of those things that are context-dependent. Luckily, the pages are editable by anyone and the slider can be displayed on pages where it makes sense.