I mostly agree with your overall gist, but I will poke a little hole here just for completeness: What does all the world have to offer? A spectrum of other cultures? Today yes, but only because the process of loss and homogenization you just said was a good thing has not yet completed. Give that same process a few more generations and the whole world will be the same, and any differences won't matter at all. It's already almost like that today. When I go on vacation on the other side of the world, it's hardly any different. If it weren't for the history and the interesting ancient structures, there would hardly be any point in travelling from any place to any other place.
The process is not complete, and so today, sure, there is still a lot of point to travel. But that is merely mass and inertia and it's eroding away.
Life is getting better in certain material ways, which are undeniably valuable, but it is not getting richer. It WAS getting richer for a while when communication and travel gave more people more access to the wide varied world than was possible before, but now, that wide varied world is becoming less varied, and so the richness is decreasing.