NOT RECOMMENDED or the phrase "SHOULD NOT" mean that there may exist valid reasons in particular circumstances when the particular behavior is acceptable or even useful, but the full implications should be understood and the case carefully weighed before implementing any behavior described with this label. RFC 2119

We may use NOT RECOMMENDED in other contexts but we are implying the same interpretation as a Best Current Practice

More Information#

There might be more information for this subject on one of the following: