I started riding long distances when toe clips and straps were the choices. Alfreda Binda Extra straps for those who appreciated quality. To get the benefit of the straps, I had to cinch them down sort of tight. Toes went numb. But my feet stayed in the pedals. No accidental releases and crashes. Dangerous to ride with your feet not securely attached to the pedals. If you ever ride in rain without your feet clipped in, you will discover shoes don't stay on pedals very well.
One of the greatest events in my cycling life was purchasing a pair of Look pedals back in 1988. No numb toes. Had to go back to toeclips for a few more years until 1992 when I acquired Time Equipe pedals with built in float. Looks did not have float and my knees hurt. But after I got the Time with float, I've never gone back to the old, painful, dangerous toeclips or no clips method. For touring the SPD, double sided only, work very well. Easy to get in and out of. Durable pedals. Crank Brothers pedals wear too quickly with their bushings. They are cheap pedals and wear accordingly. I like quality bike parts.
SPD sandals or mountain bike shoes are very easy to walk in and still have clipless safety and convenience. Not sure why anyone would ever want to use non bike shoes to ride a bike. When I go running I use running shoes. When I do outdoor work I use boots. When I wear a suit, I wear wing tips. Why the desire by people to use inappropriate footwear? Do people use mountain bikes and tires on double century road rides? Do people use time trial bikes on cyclo cross races?
Take things Grant Petersen, or anyone in the bike industry with a couple salt shakers worth of salt. They make their living from selling you things. They make their living from convincing you to buy their style.