When To Let Lawn Touch The House

Great Dixter, in England, had Sir Edwin Lutyens & Christopher Lloyd.  Seeing bits of the meadow sweep to, and touch, the house was a revelation.  Frank Lloyd Wright used the conceit.

New deck above, its patch of lawn touching a full length of it.  On purpose.  Lutyen's idea.
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Planting a STUPID row of bushes (green meatballs) along the deck provides what benefit?
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Lawn, here, is a perfection of size & maintenance.  And looks larger without the row of green meatballs.  The deck, also, looks larger without the row of green meatballs.
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Note: deck faces east, and a lake.  Finished days ago.  Furniture, pots/plants arriving soon.
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Garden & Be Well,     XO Tara