Stigmatizing negative commentary- e.g. "this is broken"- merely suppresses issues until they can't be compensated for any longer. If an employee knows something is wrong but can't figure put how to phrase it sufficiently positively, they'll just shut up about it until they can't deal with it anymore, at which point they'll either just state the problem (which will label them as a malcontent) or leave. No matter what happens, it's a loss of productivity, since workarounds are less efficient than a more direct method.
There needs to be acceptance around such statements without requiring the suggestion of a solution. If something is so broken that an employee can't even begin to suggest a fix, doesn't that seem like it ought to be addressed?