The only thing I can think of is logistics...it frees the oven for other dishes when preparing a big holiday meal. (I know similar oven based recipes that turn out delicious roasts.)
P.S. Here are a couple recipes for oven-based versions of pomegranate beef roast - FYI. https://www.kosher.com/recipe/pomegranate-glazed-french-roast-9857 https://www.wednesdaynightcafe.com/pomegranate-pot-roast/#wprm-recipe-container-2449
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(I know similar oven based recipes that turn out delicious roasts.)
Here are a couple recipes for oven-based versions of pomegranate beef roast - FYI.
https://www.kosher.com/recipe/pomegranate-glazed-french-roast-9857
https://www.wednesdaynightcafe.com/pomegranate-pot-roast/#wprm-recipe-container-2449