Olympus lenses are not stabilised. This can be a problem at long focal lengths
Lack of stabilisation can also be a problem for Close-Up wide-angle shots as the impact of any camera movement is obvious for any very close subjects, even against a wide background.
For underwater video, buffeted by water movement, stabilisation is always important, with the only exception being WA shots where the subject is more than a meter away, in which case, the relative impact of camera movement is much less. With WA shots of fish and people, often the subject is synchronised by the same water movement.