Smart idea if you pick the right shoes, silly idea if you pick the wrong shoes.
Originally, platform pedals came out way before bike-specific flat shoes were around. So most people rode with vans or similar skate shoes. Skate shoes have great grip, offer good protection, and are comy with and a nice flat profile. However, they also have a soft sole, which may be fine for bmx and jumping (and even there I'd rather have a stiffer sole), but vans aren't super great for efficient pedaling.
MTB clipless (for clipless pedals, or ones that you click into), different shoes will have different stiffness. Some are focused more on walking, and have a softer sole. Others are more focused on riding and have a stiff sole that are a little awkward for walking very far in. Unfortunately there's no rating for how stiff a shoe is, so you should read reviews and see what others say. The stiffer the shoe, the more it'll spread the load over your entire foot and reduce pain/pressur and increase efficiency. Don't confuse a stiff sole with a non-sticky sole though. A lot of the fiveten, teva, and other bike shoes have stiffer soles but retain a squishy sticky rubber underneath.
MOST MTB clipless shoes have a tread pattern designed for
walk, not riding. Since you don't need tread on your shoe when you go clipless, the tread is only used for off-bike activities. That means they're not building a tread pattern that's meant for use with flat pedals. So the wrong clipless shoes will absolutely suck with flat pedals.
There are a few exceptions. You'll notice the grippy tread that will attach to platform pedals. The vans still have soft soles so power transfer/efficiency isn't that great. The five tens should have a stiffer sole.