Should the usual economic policy principles be called into question?

The economic policy principles that seemed to be accepted are now being called into question, in particular: Demand should not be stimulated in the vicinity of full employment, on the contrary, there should be a switch to less expansionary economic policies when moving closer to full employment; There is a limit to the public debt ratio that must not be exceeded; The central bank should not let the size of its balance sheet grow indefinitely. The key question currently is whether the economic environment changed in a way that makes it possible to forget these economic policy principles; or would it be better to continue to apply them?