Ah. I see what the Olympus does now. According to this article, the Olympus focus stacks a few images and combines them in camera to make a JPEG. However, there are limitations and the author recommends using the same process I used; focus bracketing.
Details vs distance. The fungus below had countless stalactite-like fingers and was about 15 cm from front to back, a fair distance for a macro shot. I attempted to use the stacking feature, which only bracketed and stacked 8 photos when using the E-M1 Mark II. After some experimenting with the focus differential settings I had to compromise. I could capture the details of the front fingers but loose the details in the back, or I could capture the entire distance, but have too much interpolation that would blur out some of the fingers. Not willing to compromise I opted to use bracketing instead.