Do you bake an apple or roast one?
Seriously, I have dreams about hot baked apples this time of year. I can almost taste one.
Baking vs roasting anymore is cooking method colloquium interchange. We don't refer to barbecued chicken as roasted....because of the method...or because the chicken is cut or whole.
Roasted vegetables are usually browned or caramelized in part...just like most everything...a baked potato is whole but roasted potatoes are cut? It's nonsense....just like if I say I have a frog in my throat. Most people understand that I am suffering from congestion...nobody believes that I have an amphibian I can't swallow and is trapped. Just idioms of speech at work here.
John, you are right of course. However, there are places where it's inappropriate. For example, within a trade or a scientific discipline or a craft such as cooking.
It's OK to say you've got a frog in your throat. Most will know what you mean. No one is going to jump down your throat for saying that.
But terminology need to be more fixed/specific in trades, sciences, crafts. I wouldn't want my dentist to misuse the words examination and extraction for example.