I think it would make a great second camera to, say an A7IV, when it comes out. I know it has a smaller viewfinder compared with the A7III, but I can deal with that.
Other than that, I can see enjoying shooting with the A7c with my Sony 35mm f/2.8 on it. A nice compact kit. And, to be honest, I think it looks cool. I can consider things like that on a backup/travel camera.
I'm building down my photo kit (selling off two cameras for every new on that comes in). But, now that my wife gas retired, this is going to have to be a kit that I will live with for a long time.