My email disallows images and javascript/html. I have yet to suffer for this. If anything it’s like the Adblock of email. And I’m not one of those “block all javascript on the Web” people.
Same (including that I am not one of those people who block JavaScript on the web; hell: I don't even use an ad blocker), though a few times a year I do run into a service that both explicitly provides a text/plain segment (so the mechanism that would just try to give me the text from the html segment isn't used) that is useless (missing links, doesn't have a text form of some code, etc.) and I have to open the code…
I didn’t even realize JavaScript in email was a possible thing until I opened this thread, and still don’t understand the use case for it.