Clipless or not is one of those things we each get to choose. I think I've done the clipless tumble three times in a dozen years, all slow speed. One of those was a broken crank, I don't know if I could have avoided that with platform pedals. For what clipless gives me, that's a good trade-off.
The two big things clipless does for me: First, it keeps my feet on the pedals and lets me maintain a high cadence. Nothing is worse than charging a hill, cranking away like made, when your foot slips off the pedal and down you go. Doesn't happen with clipless, and the high cadence saves my knees when riding up ridges with a load.
Second, it lets me use stiff shoes and locates my food on the pedal where I want it. After 25-30 miles in sneakers, my feet are talking to me, and they ain't happy! Good clipless shoes distribute the pressure over a wider area, and while my feet may get tired, they don't get sore.
I typically carry a pair of Teva sandals when touring. Great for showers in strange, dark venues. Get out of the shower, put on some socks, go for a walk. That's a half a pound (in my large size) I'm happy to carry.
BTW, the great thing about MTB clipless pedals is you don't go skating when you stop for lunch, a snack, shopping, etc. I use Speedplay Frogs instead of SPDs, but they're similar aside from the clip. I'd have to be on one of those century-a-day cross country supported rides before I'd consider road pedals on a bike tour.