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The problem is that, while spds do allow a certain amount of lateral float, these flats do basically lock my feet into one position due to the location of the pins and the slight dip in the middle. I think @dbr has a point though, using normal shoes probably isn't as good as using cycling shoes. My dadbike does have a wider Q, but the pedals just exacerbate this by guiding my feet away from the crank.
More likely to be a saddle height / position thing than a pedal thing I’d thought.
Can’t imagine locking your leg in one position is better than having it free to find a more natural position on a pedal?