The comment that technical means it reduces your options isn't always true. The bigger your skill set the more options you have.
Some very technical and difficult runs do require very specific skill set that must be performed on demand. However, most technical runs just require that you perform on demand to control your decent in safe manner.
As an example trees are technical, you must pick a line and turn as required not to hit one. Requires some technique (skill).
Some beginners run trees safely, so they have enough skill to manage that run. A beginner is very limited in how they ski this run, an expert skier skis it with a vast range of options and speed to run the same run. Difference is range of skills on demand.
But regardless of your skill set, there is terrain where your options become limited. If you have a fairly high skill set, the terrain needs to be much more difficult to limit your options.
For example, an intermediate skier might consider a regular mogul field technical. Their options are limited by their ability, then further limited by the terrain. On the other hand, I wouldn't consider an open mogul field technical, because I have the skill set to navigate it in just about any way I please. A 6' wide, 35 degree chute in the trees, that I would consider technical for me. Because I have very few options available, even with an extensive skill set.
Just like so much else, technical is largely in the eye of the beholder.