One issue is content injection. You never know what transparent proxies are between you and the server, any one of them can add / remove content, scripts, track

One issue is content injection. You never know what transparent proxies are between you and the server, any one of them can add / remove content, scripts, tracking stuff etc to the static pages. You can't even be sure if your current DNS server resolved to the actual server and not some shady proxy. I believe Comcast has been accused of doing something shady like that but I don't live in US and have no idea. Just read the news.