One consideration would be to remove the requirement (whether it's written or implied through other policies) that if the government posts something to a third-party site (e.g. YouTube) then they're also required to post (and host) that same content on their own .gov site. This seems to be the implied rule and can end up leading to additional resources being expended which otherwise would not need to be.
Granted, there are accessibility considerations that need to be taken into account. However, as it stands now, if you're posting video to a YouTube Channel, you also need to host that same video on your own .gov site.