Are there any other advantages to be had?
Plenty of advantages in m43rds, both Olympus (OMDS as it is called these days) and Panasonic.
But first you must decide what and how you are shooting and what is your final output.
If you mostly shoot low light, wide open f2.8 or faster lenses and/or you like ultra-shallow depth of field and/or you need to make A3 or larger prints of things that move... Then sorry, m43rds is not for you. As the old saying goes "There is no replacement for displacement". Basically I can't in good conscience recommend m43rds to wedding and sports photographers (even though I know a few that use it).
If you mostly shoot at f4 or stopped down at f5.6 or slower, you're happy to have more than just the iris of your subject in focus and/or you keep your output for web and A4 prints then you might actually be better off with m43rds than FF.
And that's because :
1) m43rds can be better value than FF ... for example, if I were to match my current main m43rds kit with one based around Nikon Z6 III I'd pay between 50% and 100% more (list prices) and I'd get at best around 1 stop better light gathering capabilities, similar build quality, similar sharpness from lenses, more weight to cart around, less features, less speed.
2) m43rds can be better featured than FF ... the high end cameras m43rds have the best implementations on the market of things like High-Res mode (getting you up to around 80Mpx with noise and dynamic range comparable to FF cameras), focus stacking and dual-IS. Also a lot of unique features that, while situational, can help a lot, like a simulated ND filter for those times you want long exposures but you don't have the filters with you, Live-Comp to remove the guess-work from long exposure and light paint scenarios, a software distance limiter that can be configured to where you want it and enabled quickly by a button and so on...
3) m43rds has some rather unique lenses ... like the Panasonic 10-25 and 25-50 f1.7 that plenty of videographers seem to be enamored with, the OMDS 8-25mm f4, the OMDS 12-100mm f4 lens that most people praise as the best all-round zoom ever made, the OMDS 90mm f3.5 2x macro with AF that can take TCs.
4) Finally size... yes, m43rds lenses can be small. But the rule of thumb says for similar light gathering capabilities, lenses will be of similar sizes (e.g: OMDS's 1.2 primes are comparable in size with Nikon's 1.8 primes, while they offer similar DoF and light gathering abilities).
Then again, the biggest m43rds body with the standard macro lens vs a Z6 with a 105mm f2.8 ... :
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And in a blind test you couldn't tell which image was shot with which kit.
Now, to close this, I'm gonna put it like this: I've shot plenty of FF, APS-C and m43rds over time. And there are situations where a larger sensor (especially FF ones) will get you better image quality. But the difference between them is not as much at the end of the day as people believe.
And when it comes to value for money, features for money and just having a complete kit that can tackle most of the challenges of an advanced amateur photographer/videographer and even a pro one, m43rds is hard to beat.