> Aggregates are too heavy. You need to make the decision about what is or is not an aggregate way too early in the design process. Boundaries are fuzzy.

I've had the exact same complaint. I think there's a lot of great stuff to take away from DDD -- I also hear myself frequently making the same point about it's ubiquitous language -- but going all-in on some of its concepts, especially early in a projects life, is probably always a mistake that may well end in disaster.