I am extremely disappointed in you, Kotaku readers, for not bringing this Japanese Dragon Quest Builders commercial to my attention a year ago when it first aired.
It is perhaps the most informative and helpful look at Dragon Quest Builders one could find. (Skip to 0:29 here.)
If, after watching this, you still don't see what makes Dragon Quest Builders such a phenomenal game, I don't know what to tell you. You could try this follow-up video if you really need more explanation?