> I don’t like it being proposed as a solved, no brainer when there should be considerations.
> I wish sites would present serious arguments rather than assuming simple, weak versions.
It seems to me that considerations on this matter has been seriously and carefully taken in recent years and you seem to be the one going against today's consensus. The charge of providing evidences that HTTPS is not always the right thing on the Web is therefore probably on you¹.
I care about both ecology (if this is your point?) / efficiency and privacy and still prefer that encryption by default. It seems to me that HTTPS is not a significant overhead.
But providing privacy to people who really need it (and not for the wrong reasons) without them looking suspicious is badly needed for a well-functioning society, and this includes good decisions related to ecology.
I would suggest you to build an HTTP-everywhere extension, but many websites will refuse to serve your requests on HTTP so…
1: I actually can see an issue for HTTPS everywhere, and this is that it makes websites unreachable to old devices. But there, outdated browsers are probably an obstacle too, and I guess it would be possible to set up some kind of HTTP proxy for them (?)