I'm pointing out flaws in your reasoning. Bulbous and small aren't good categories, especially when you recognized that raspberries are different.

I would contest that the nature of a cultural berry is being a small sweet fruit that typically wants to be eaten. Strawberries sit alongside gooseberries, raspberries, cherries, and all the other traditional berries in this. Strawberries are certainly unique in their structure, but that doesn't change how we eat them.

The botanical berry definition has little to do with the cultural definition besides taking the name. Try looking at the botanical definition of tree sometime. Does Bamboo count? Palm trees? Ginkgo? It's a strategy for than a rigid group.