Deferring contexthub.kernel.js

AEM version: 6.3.2.0

We are in the middle of making performance optimization on our site, as such we are deferring any and all JS scripts with `defer` attributes to prevent scripts from render-blocking. We are using contexthub so naturally, we see the following script:

<script src="/etc/cloudsettings/default/contexthub.kernel.js" type="text/javascript"></script>

We want to add the `defer` attribute to that script; looking at the JSP the renders this script: /libs/granite/contexthub/components/contexthub/contexthub.jsp we see that the only option is to overlay that JSP, which is not a great option especially if Adobe makes changes to that JSP in future releases.

Here are my questions:

1. Are there any drawbacks to deferring contexthub.kernel.js? I.e. is it render-blocking for a good reason?
2. I see that the contexthub.kernel.js has dependencies on other code like Granite.HTTP.externalize and I see in the codebase that those dependencies are included in a different clientlib. How are those dependencies included usually? I could not find any documentation around that. I assume that script should be dependency-free since it already includes jQuery and other stuff.

Any help is greatly appreciated. Thank you!