Question BIND vulternability

[shaharhada]

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The BIND 4 and BIND 8 releases both had serious security vulnerabilities. Use of these ancient versions, or any un-maintained, non-supported version is strongly discouraged.
what is the meaning of strongly discouraged?
From Wikipedia source:
https://en.wikipedia.org/wiki/BIND
Under the title Security?

 

[USAFRet]

what is the meaning of strongly discouraged?

= "You probably should not use it"

 

[shaharhada]

Thanks.