Having a minimum of 10 piece of terrain doesnt cover a 6'x4' well.
The Dangerous terrain aura special rule is a bit janky. On paper prefectly written, actually playing it will be a slight issue.
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I usually play with 10 piece of terrain and it's well covered. But my club had big terrains, so I'm certainely biased.
The few times i see the dangerous terrain special rule, it's a little piece of terrain easy to dodge, i wanted to try something where we are forced to walk in. Maybe bad for competitive but with potential for narrative.
need to say large pieces of terrain in this case, because barriercades, are scatter terrain, they are still pieces of terrain.
The issues with the rules, is that requires a lot of measuring, and the start point of the measurement is going to change between the two players. Naturally it would be from the center of the object, but alot of time its not prefect, and it can change the outcome. It's not overly a huge issues, just a consideration