It seems that my Sony A6400 is “just right”.  I tried some larger and smaller cameras and had issues with them.

I am returning the Leica D-Lux 7 because it is too small.  The buttons and levers are too small for my fingers.  I have to use a fingernail to operate the on-off switch and there is no way that the camera would be operable when I wore gloves. 

The D-Lux 7 camera is also too complex with too many menu options in addition to the small external buttons.  I kept setting it up differently for different purposes and then finding it took too long to reset them correctly in a hurry when the need arose.

All of the above issues along with the high cost turned me off.

So far, the Sony A6400 and APS-C lenses have been working well for me so I will stick with them for now.  When the larger size or weight of zoom lenses are bothersome, I will use prime lenses or use the Olympus TG-6 instead, at least until I try something else as a one and only camera.