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Sealing is better, but there's a scale of involvement. My folks have an overpriced umbrella thing in their basement chimney as there is an old fashioned coal stove thing there. It means theoretically you can quickly remove it.
Other ones are sealed just up the chimney with a black painted board with a square of insulation on top.
hugo7
On the subject of burners and shit, our chimneys are still open but it's highly unlikely we'd ever use an open fire or even the gas fire again. Do they need to be sealed or can they just be left as is? I imagine they are a good way to vent heat out but then there are probably worse offenders in our place.