Cosmetic wise looks better plus without them there will be a gap around 40mm, this way is better than putting fillers. See pic below with decor end panel and without. there will be plinth as well.
I'd agree with the comments about keeping clearances at the sides of a slot in cooker fairly tight - yes, you need to be able to get it in and out, but bigger gaps seem to be a magnet for all sorts of muck, loose cutlery, food wrappers, etc. Whilst not the most beautiful things in the world, I find the old fashioned metal end caps are sometimes very useful in this situation as they can not only stop minor spillages going over the sides, but they also won't fall off because the contact adhesive (used on laminate ends) has dried out because metal ends are siliconed and screwed instead. They also protect the ends of the worktops when manouevering the cooker out and back in for cleaning, servicing, etc. Does tend to be a rental property approach, however
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