Leaves, pine needles, small twigs may accumulate along the side support and roof but this material can be swept out, washed out, or blasted out with air. The positives of the Bowfin greatly outweigh this minor issue.
I've state my preference for the Bowfin rack and low profile is only one criterion. With the fairing wind noise is negligent nor has it reduced fuel mileage. Because the rack is modular shipping costs are reduced and it can be assembled by one person on the roof. The Bowfin weighs <60 lbs and...
I'm really liking the Bowfin rack I'm running on mine and low profile was one of my requirements for a rack.
https://forum.ih8mud.com/threads/bowfin-rack-on-60-series.1285920/