alt Hacker NewsThere is one hard wall that stops very old clients from connecting: Not supporting a new enough version of TLS. TLS 1.2 is from 2008, and TLS 1.3 is from 2018. Web browsers older than 2008 can't connect to modern websites since TLS 1.0 and 1.1 were deprecated from web servers in 2021.
I still think it's worth it to provide connections over plain HTTP for this reason. It probably doesn't apply to many people, and you shouldn't allow anything really important to happen over plain HTTP (logins, payment), but normal viewing should still be possible.
Sadly, the internet as a whole seems to disagree. Even the most useful resource on the web one could use over plain HTTP, Wikipedia, only allows connections over HTTPS. I guess it kind of made sense as part of the campaign to push the internet as a whole over to HTTPS, but anyone who's connecting to any website over normal HTTP these days is doing so because they literally can't use HTTPS.