You sound very confident of that, but the fact that investors and developers keep moving to the platform shows that there's a good chance you're wrong.

From what I can tell, the new hybrid architecture that D-Wave rolled out recently can handle way bigger optimization problems than before, and slice and dice them to fit on the still-fairly-small quantum chip. As long as optimization problems are important (and they seem to increasingly be so), something which can find lower energy states (better solutions) in a shorter time is indeed an advantage.

I for one find it refreshing that they're not always blowing smoke about supremacy the way Google is - instead, they keep pushing forward actual results, like this one published in Nature: https://www.nature.com/articles/s41586-018-0410-x about some spinglass thing I don't understand, but it seems like it's something ideally suited for what they're building.