Don't you get problems with sharp edges that way? Also, even short cans have a geometry that I would expect to be hard to clean out completely with a cat's relatively short tongue. Also, cans are very light, doesn't the cat move the can all over the place compared to a heavier feeding dish? So many questions...
> Also, if you don't feed out of the can, now you have to store half a can of wet food in your fridge (ew).
Around here many people have reusable plastic lids to put on open cans, those work well. The bigger problem is feeding fridge-cold food to your cat, which is apparently not ideal. When I had cats we mostly fed them with individual portion-sized pouches. That generates a lot of non-recyclable waste though.