From: Winnipeg, MB
Cost of testing is not a topic here, the slogan is "whatever it takes".
Nevertheless there is a change in testing strategy, especially in southern Germany (still not yet the whole country).
It's said, that the limited testing ressources are concentrated now on vulnerable groups, that means persons with symptoms and older than 65 or already chronical ill or medical workforce. It becomes harder from day to day to test area-wide. People should stay at home, when they have mild symptoms only.
South Korea seems to be no model anymore, because the situation is not comparable. There you had a managable group of infections caused by this crazy religious group, which you could contain and track down. Here, and of course in other european countries, you have a nationwide impact from travellers all over the country, coming back from winter holidays.
Another point is, that tests of people without any symptoms are not safe enough. The first 2 - 3 days after infection tests are often negative, so you have to test the same people 2 - 3 times.
Source for this information is Frankfurter Allgemeine Zeitung ,that means a reputable nationwide paper (article has to be paid and is in german)
The medical workforce one is not a one-time test per person. These people are potentially in contact with infected patients and the aim is to prevent the medical staff from transferring the virus to other patients or their families. As I understand it, the tests do not detect the infection for the first week, so each medical worker should be tested once a week - ideally. I don't think we will ever get that many test kits available or get that disciplined in our efforts. Waiting for symptoms seems to be the norm.
No matter how bad a situation is, you can always make it worse. - Chris Hadfield : An Astronaut's Guide To Life On Earth