You just explained why "technical" is back handed. Real BJJ masters don't just hang. They own you.
The "umph" is what differentiates someone who really knows BJJ from someone who just watches a lot of cool DVDs. It is the part that no one can easily explain how to do step by step but everyone can feel instantly when they get on the mat with you.
Guys like Marcelo are obviously extremely technical. There are plenty of threads on here from people who have experienced rolling with him. Yet none of them describes him as technical. He does not merely hang in there; he crushes. Marcelo has "umph". He is a master.
The random guy who subscribes to MGInAction and tries the latest moves in rolling? That guy is "technical". No one would confuse him with a real master like Marcelo. It is night and day.
The analogy of flow is used a lot in BJJ. And it is important to know how to flow. It is the source of true power.
However, people mistake knowing how to flow with knowing how to trickle along like a little relaxing creek bed. This is the flow rolling, and it is an important ability to have. It is also a good training tool at times. But it is fake BJJ.
The real BJJ is flowing like a fire hose. It's an astonishing power that overwhelms the opponent. Even though it's just water, it can knock someone off his feet.
No one describes rolling with a real master in terms of how he flows like a creek. Lots of people can do that. "Technical" guys who watch DVDs can do that. People describe the roll in terms of how unstoppable the master felt. That is the true BJJ that not many people can do.
To be satisfied with being "technical" is to be satisfied with mediocrity. It is a minimal level of competence. It does not impress me, I look down upon those whom it does describe, and I take offense to those who describe me that way.