From an exercise point of view the lactic acid moves through your system better if you always keep your legs moving. Coasting is bad.

From a mechanical point of view. 1 less freewheel, 2 less breaks = 3 less things to make noise, break, or have to replace.

From a mental point of view, no clicking to annoy you, you slow down and speed up with your legs, less to think about and your hands can be in any position you want.

From an ease of use point of view, you can trackstand so you don't need to clip out.

Milo