Is there some sort of misunderstanding about why moving to HTTPS for everything here is a good thing? I find this post very confusing -- it isn't difficult to s

Is there some sort of misunderstanding about why moving to HTTPS for everything here is a good thing? I find this post very confusing -- it isn't difficult to set up HTTPS for a blog, so it's unclear to me why people wouldn't. Yes, some historic components of the web may struggle to move to HTTPS, but there's no problem in that, however we should be looking forward.