My travel cameras have been an S95, then S120, and now G7X II. I have taken good pictures with all of them. The S120 is small enough for me to throw in as a backup when I go on a long trip. The G7X II is at the upward end of what I consider pocketable. If I wanted something between it an my Rebel, I'd go mirrorless, I guess. Or maybe I could just put a nice pancake lens on the Rebel to travel sort of light.
The S120 would fit in my shirt pocket if nothing else was in there. The G7X II is just enough thicker that it won't. But it is fine for a jacket or pants pocket, though at the limit of what I'd want to put in the latter. So I don't think I'm likely to go for a G-class camera with an even bigger sensor.
I think the move to a so-called 1" sensor was worth the extra lens bulge and the loss of zoom between 100 and 120mm equivalent. (The increase in resolution is such that cropping a 100mm shot on the G7X II to the same coverage as 120mm on the S120 still gives more pixels than the full S120 shot.) (Using TV camera tubes from the '50s as the standard for digital sensor measurement strikes me as really odd.)
Right now I have two pictures I made in Scotland with the G7X II printed out on 13" x 19" paper lying nearby, waiting for me to put them into the frames to hang in my hall gallery. Looking at them close up, the only problem I see is with the landscape: I might have overshapened a bit for printing, so that some features on the ground in the right part of the picture look a little too prominent. That will likely be toned down enough in the fame and being viewed from a normal distance. If not, I think I still have the file I used for printing, and I could go back and mask (or partly mask) that area on the sharpening layer and reprint. It is certainly no problem with the camera or sensor itself. The chapel interior shot you may have seen in a thread here on DR and/or HDR, since it has detail in the murky corners without washing out the stained glass windows.
Between the quality of these pictures and of my recent eclipse pictures made with my Rebel and marginal 75-300mm zoom, I'm wondering why I'm contemplating spending $2,000, plus maybe a kit lens, to get a FF.