Horse shit is mostly grass and other plants and doesn't really smell much. It will rain away or compost to dirt much quicker than smelly dog poop. But yeah, might be an idea to shuffle it out of the trail.
It's still shit. When I have to avoid it while biking or walking, it interrupts the tranquility of my enjoying the trail.
On a more serious note, a major problem with animal feces on trails that are shared with bikers is the risk it poses when you run it over, and it splatters all over the place. If it gets in your mouth, or on the nozzle of your water bottle or camelback, you can get sick.
The horseshit is awful on the trail up Half Dome. It may not smell that bad to someone who loves horses, but I assure you it smells to someone who doesn't.
On a more serious note, a major problem with animal feces on trails that are shared with bikers is the risk it poses when you run it over, and it splatters all over the place. If it gets in your mouth, or on the nozzle of your water bottle or camelback, you can get sick.