Why do more cars now have a short spoiler above their rear window?

Is there some aerodynamic advantage to these short spoilers? Or maybe does it help to keep dirt from accumulating on the rear window? It seems like I'm seeing this feature more and more lately

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Why do more cars now have a short spoiler above their rear window?

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This curved roof spoiler design measures at 2 5/8 wide & 1 1/4 high. Spoiler is made from high quality polyurethane material and will sit flush

Honda Civic 4dr 2022-present Rear Window Roof Spoiler (284R)

✅Fitment: Compatible with 2022 2023 2024 BMW (G42) 2-Series Coupe Only ❗️ ❗️( Do Not Fit For Gran Coupe Or 4-Door ) ✅Material: Made From High Quality

Q1-TECH, Rear Window Roof Spoiler Compatible with BMW (G42) 2-Series 220i 230i M2 M240i Coupe (2022-2024), Real 3K Carbon Fiber Rear Window Roof Visor

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