Less things to go wrong and less spares to carry for longer / remote tours. Spare cleat bolts or cleats.

less foot wear to carry on tour, especially if your crossing very different climates. Sandals and boots for deserts, jungles and mountains.

The ease of walking off the bike ( I use MTB shoes which are ok off the bike but far from comfy!)

When in cities and town during hours of traffic and finding accommodation / warm showers locations, stopping navigation checks. I found that i was clicking in and out all the time and its becomes very tiresome.

On the longer uninterutped sections I prefer SPD's for sure, maybe these combination flat and SPD's are the way to go. Are these weight biased so that they always settle in a flat up position and you need to flip then over to get at the other side?