In a situation where time spent preparing is not counted, clipless provides a small advantage.

In a situation like commuting, I find that any performance gains I might be receiving are offset by the time spend changing shoes at the beginning and end, the extra hassle of trying to carry shoes with me, etc.

There's a lot of arguments on either side - perhaps you simply enjoy riding clipless more. Or less. Perhaps you are doing more "setup time is not counted" rides elsewhere, so you want to reinforce the motions and muscle patterns you will need when riding clipless is of small benefit. Perhaps you want to look like a biker - I would not enjoy riding a pink bike with tassles into work each day, others prefer to go with the clipless look for the same reason that sports fans wears jerseys. It certainly doesn't hurt anything. While I find it more troublesome to find shoes, cleat angles, etc with clipless, it seems easier to get an accurate fitting when my foot doesn't move around on the pedal during the fit.