Eeeaaaahhh..... I don't think many suppose this. The biggest thing wrong with it is that we don't travel due to the expansion of the universe. The rest of the universe is doing all the traveling. The motion that started with the Big Bang is, at every location in the universe, aimed directly away from us, at a speed that appears proportional to how far away that location is from us (though this gets a bit messy because there are different meanings of "how far away). But, somebody else located far far away from us could also say exactly the same thing, everything aimed away from them. It's because the space itself is growing, not because the things in it are moving (which they also are but just in incidental ways). On the grand scale, none of the objects in the universe are accelerating, they're just floating. However, as they get further away from us, the speed at which they recede keeps increasing. It's what the space itself is doing, not what the things in it are doing. Yeah, on top of that, things get attracted to each other and fling each other around a bit, but that's just local variation, not universal.
I way appreciate the kind words!! You're a kind person and a scholar!!