My straight-up commuting/city bikes tend to have flat pedals, for sake of convenience. I don't like walking around in bike shoes, even walkable MTB shoes. And I don't bother with foot retention other than clipless, no toe clips or power grips for me. Tried em all, not a fan. But I do have clipless pedals on my road and cyclocross bikes, and I do ride those bikes to work pretty frequently. I keep a spare pair of shoes at work for that reason.

"Unless you're racing" is perhaps the most vacuous, misguided phrase in all of cycling, because it's used to gird all kinds of habits in a kind of defensive rationalism. I've said myself that I keep bikes around without foot retention of any kind, because it can be a pain. But there are plenty of reasons, totally unrelated to racing, that clipless pedals can be a good idea. A big one for me is that clipless pedals can be shimmed and adjusted to compensate for anatomical issues such as leg length differences to prevent or ameliorate injuries as a result. Riding a few slowish miles around the city is fine, but for the bikes that I will be riding for thousands of miles a year, often at high intensity, clipless pedals are a necessity.