Foot retention plenty strong plus I can walk around in my shoes if necessary. I once commuted to work only to find someone had stolen my work shoes; wore my bike shoes all day with no trouble.
I have no float problems on any of my bikes with spd (mtb.) pedals. I do prefer road pedals on my geared road bike but that's where I'm doing a 60-80-100 mile ride with almost no walking.
Around town, to and from work, or on the mountain trails; I prefer my mtb. pedals.
Even if you decide to use clips and straps; get some stiff soled shoes.