There's nothing wrong with using platform pedals - especially for city riding. You may find them much more sensible. My pedals are double sided - SPDs on one side, platform on the other. I commute to work in my regular work shoes. Short things around town, going to the dentist, eye doctor etc. I use the platforms. I have looked for shoes that are flat, reasonably stylish and comfortable. I like a more rigid sole too. Summers I wear white sneakers from LL Bean. For the winter I wear a couple of pair of Eccos.

Clipless is NOT a necessity! If you prefer it - go clipless by all means. If you're racing you probably need to be clipless. For a long ride, I like to be clipless. But it won't make you substantially faster. I know, I've timed myself both ways! Or climb better. I've tested that theory too.

Enjoy the ride!

Veronica