EbS-P
Minister of Fire
Take the surround off of some insets and they can too. But then you have to have floor protection. And for a raised hearth it’s not required if you have your 16” out in front.That all makes sense.
Regarding the size; a stove can protrude into the hearth and be bigger than what would fit in the fireplace. (At a cost of space used that an insert would not.)