Last year I started buying used M43 gear again to complement my Fuji-X gear. I enjoyed M43 around 10 years ago and I missed my E-M1 12-40mm pro combo. I never found something like it in the Fuji lineup.
So far I collected some nice old Olympus cameras and added several lenses,. I'm starting to notice that for me personally the zoom lenses make the difference in this system.

-14-42 EZ as a great super compact combo with my silver E-M10 II.
-12-45mm f/4 PRO as a nice balanced higher quality setup with my black E-M10 II.
-12-40mm f/2.8 PRO as a larger, WR 'do it all' Swiss army knife combo with my E-M1 III.
My shooting style is travel, street and family. No landscape or wildlife.
I noticed lately that my Olympus prime lenses (17mm, 20mm, 25mm and 45mm) don't get a lot of use. All very nice lenses with fine image quality. But not as engaging to use like my Fuji's with prime lenses.
Probably because the less shallow DOF on the M43 sensor compared to the APS-C sensor of my Fuji's. The Olympus F/1.2 lenses are too big for my personal taste.
My personal conclusion is that I really enjoy M43 for daylight all purpose photography, but I still keep my Fuji's for the prime lens magic feeling.
Right now I'm considering selling my Olympus prime lenses, but I really would like to see some opinions about this. M43 is all about compactness and I personally see more advantages in the zoom lenses than with prime lenses.
So far I collected some nice old Olympus cameras and added several lenses,. I'm starting to notice that for me personally the zoom lenses make the difference in this system.

-14-42 EZ as a great super compact combo with my silver E-M10 II.
-12-45mm f/4 PRO as a nice balanced higher quality setup with my black E-M10 II.
-12-40mm f/2.8 PRO as a larger, WR 'do it all' Swiss army knife combo with my E-M1 III.
My shooting style is travel, street and family. No landscape or wildlife.
I noticed lately that my Olympus prime lenses (17mm, 20mm, 25mm and 45mm) don't get a lot of use. All very nice lenses with fine image quality. But not as engaging to use like my Fuji's with prime lenses.
Probably because the less shallow DOF on the M43 sensor compared to the APS-C sensor of my Fuji's. The Olympus F/1.2 lenses are too big for my personal taste.
My personal conclusion is that I really enjoy M43 for daylight all purpose photography, but I still keep my Fuji's for the prime lens magic feeling.
Right now I'm considering selling my Olympus prime lenses, but I really would like to see some opinions about this. M43 is all about compactness and I personally see more advantages in the zoom lenses than with prime lenses.