> The main threat that HTTPS everywhere secures against is preventing your ISP from analyzing your traffic in order to build and sell an advertising profile on you.
That is not true. The main threat it protects against is MitM (man in the middle attacks) that allow someone to redirect all traffic to a website through their machine and thus see all the data including your password.
HTTPS when combined with root certificate trust is very effective at preventing these kind of attacks. Without it, using any shared internet at all (such as a company, school, or coffee shop) to log into any website or enter your credit card would be trivially easy to hack.
Seriously, I can boot up Wireshark, go to my coffee shop and easily see every non-HTTPS communication going over the network. IM messages, emails, and in cases like this post suggests... passwords too.
Edit: As a side note... I do this all the time to reverse engineer the wireless protocol for IOT devices since most of them do not use HTTPS yet. I use it for personal use but it could be used for harm as well. For instance, if the security cameras are IP cameras over HTTP I could probably intercept the password and use it to remotely turn off the cameras.