That's a good point. I understand the importance of having a default format that can preserve every bit of data Gimp is capable of creating. But it makes a lot

That's a good point. I understand the importance of having a default format that can preserve every bit of data Gimp is capable of creating. But it makes a lot of sense to have one dialog that can save in both formats, especially since the dialogs support choosing the format automatically based on the extension.