Yet ovens are not open at the top. I can see an argument about hot air rising, leading to unevenness, or about hot air drying out the bread, but 'the toaster w

Yet ovens are not open at the top. I can see an argument about hot air rising, leading to unevenness, or about hot air drying out the bread, but 'the toaster would get hot' doesn't make sense to me. Regarding horizontal toasting, that is something I had in mind. I might hack my broken toaster to try this out.