I enjoy hiking as part of my touring style, so I use walking shoes with platform pedals and toe clips. That's worked for me for over 40 years. I tried cleats with MTB shoes on one X-C tour and for several years of commuting. They were OK, but eventually I went back to the old way. Walking was just a little tricky--I didn't like hitting rocks with the cleats and slipping. Walking securely was more important to me than the cycling gain.

Another reason was cost. I see some pedals that cost as much as my current bike, not to mention the shoes. My current platform pedals and toe clips were very reasonably priced and have lasted a very long time.