It fills the gap because you decouple the app from the OS. So while the OS that is hosting the app is end of life, the app itself is not. If there are bugs/vulnerabilities in the app, they will still be there. Granted, there are situations that *could* allow a container to hide a vulnerability.
As for GW vs Docker, one is not superior than the other when they do not compete. Even PT has mentioned that they go after different things. I want to be clear that this does not detract from GW's full potential. it's just going after a different problem.
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