Yeah, https for local network appliances has been basically a nonstarter for ages, with the browsers basically shouting down any proposal to enable it with "it's not secure enough", while the trivially-sniffable status quo trundles on just fine (and administering your own root CA is a non-trivial amount of work for those who are capable of it, as well as opens you up to further issues given most browsers ignore the scope of root certificates, so anything you trust on your machines you are trusting for all sites).