Is there any disadvantage to moving a small and frequently read read-only table to in-memory OLTP?

Suppose that you have a table which is: * Read from so frequently that it is almost always in RAM. * Very small. * Almost never changed. Is there any disadvantage moving such a table to in-memory OLTP? My thoughts are that if it's always in memory anyway, then you should consider using the architecture designed for living in memory.