SS/FG has less moving parts, less to maintain or go bad or out of adjustment. I've put ~1000 miles on mine with zero maintenance beyond cleaning/lubing the chain, and I've only done that a couple times. Cleaning a cog or single freewheel is considerably easier than cleaning a 10x cassette, and the same for a single chainring vs. a 3x.

Wheel for wheel, spoke for spoke, a non-dished configuration is stronger than a dished. SS/FG chains are thicker, stronger, last longer. SS/FG has a more efficient chain line.

Riding a SS/FG demands that you become a stronger, more efficient rider as compared to riding a geared bike.

Works for me...