I like my APS-C sensor size, and unfortuntely the G1X Mark III costs more than the M50 with the 15-45mm collapsible lens.
I'm also thinking about getting a speedbooster so I can use EF lenses closer to the equivalent of full-frame. Could do that with the M100 but since the M100's controls are just about all on-screen, it would be easier with a camera like the M50 where the controls are on-body. Kills two birds with one stone.
Ah so having it handy in the car is just an excuse for a bit of GAS - your choice is fully justified then!
Gear Acquisiton Syndrome I assume?
Perhaps. On the other hand, I don't see a lot of benefit in buying a point-and-shoot when the money for a point-and-shoot could well go towards something that provides for many more options, most of which are compatible with the equipment I already have. Part of why I went Canon when I ultmately bought the 77D was familiarity and comfort with the EOS system generally, to me this would be keeping in the same vein. Additionally since the 22mm f/2 EFM lens lives on the M100, a body-only M50 found inexpensively would immediately get the 15-45mm.
Right now I frequently bring a backpack containing the entire orange line in my sig with me. I do this in part becaue the DSLR with any of the zoom lenses is large enough that there's little benefit in bringing just the camera and one zoom lens as it won't fit in the center console or the glove compartment, I would still need a bag. A mirrorless with a similarly physically small lens offers more options for storage. I could bring the DSLR and kit out when I specifically want to shoot, but I could have the mirrorless on-hand if I see something that I want to shoot when I otherwise wasn't specifically looking to do so when I set out that morning.