Teleology is the human habit of explaining things by figuring out how those things might function, in a way that makes sense to a human. It doesn't always yield useful explanations.
Not all Bulbophyllum species tolerate dry seasons. Presumably extant Bulbophyllum species evolved from ancestors having pseudobulbs. Some ancestral orchids may have evolved pseudobulbs to survive droughts. Extant Bulbos may have lost the ability to survive drought, since they never experience it, but retain pseudobulbs they inherited from their ancestors.
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