Precisamente habla sobre fotografíar en sitios con poca luz...
Which brings us to the actual point. For example, last time I shot wedding in a dim church, and especially when shooting in an even darker party place with a full-frame, I often had to reduce the aperture so that the depth of field was not too narrow. This means that the ISO value had to be raised. With the mft equipment, I can shoot wide open without worry, because DoF corresponds to twice as small FF aperture.
So, for example, with the RF 70-200/2.8, I often had to reduce the aperture to f5.6 in order to have everything needed in focus, while with the mft I would have ended up with the same at f2.8. But with at a lower ISO.
Of course, with FF, I can get narrower DoF when needed. How important is it? Not much for me, I usually want a bit of context around the subject. Sure, when I want it, I do have FF.
My point is, that I have noticed many times that in real life situations mft is at least as usable as FF for me. And nowdays when AI softwares like Topaz Denoise etc. are getting better and better, it is reducing the sensor size difference even more.
Every system is awesome these days. If you enjoy shooting mft, remember there’s not much you miss from FF world at the end of the day. And you also definitely get some cool things FF is missing.