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I've got pedals with straps on the back of my tandems - mainly to keep my kiddy stokers feet engaged.
One of the tandems has an old SA 3 speed hub, I found out on Monday that 2nd gear slips, my foot whizzed round, slipped off the pedal and the pedal hit me hard on the back of my non broken ankle. Oh how I laughed. No clips / straps on the front, and I was wearing some racing flat trainers
I mostly use flat pedals. I did half of the TCR in 2019 with innov-8 trail runners. They were fine. I've also used five tens and other flat pedal shoes for long rides.
I use catalyst pedals, which are massive and designed for mid foot. If you pedal with the balls of your feet then normal flat pedals like DMRs would do.
I've never used clips and straps. Don't think they're necessary or useful, and I wouldn't want the hassle on a tandem. I'm riding a tandem this year and it makes it feel a lot less risky starting off knowing I can just put a foot down whenever.
Basically I think clipping in is overrated, unless you are racing or riding in a bunch. So much easier if you're touring to be able to walk easily.
Your feet are likely to bounce off the pedals a bit if you have too high a cadence off road, otherwise really no issues.