You're totally right - many people do have image blockers turned on, which definitely can make it so that the signal we read in the ab test could have been inaccurate.
The test also indicated that retention and visit days to the massdrop site increased in the group with the new subject line.
I wish everyone looked for the subject line the same way you do and was as remarkably dedicated as you are to the experience and improving it for yourself and others. Sadly, according to the data the majority of people prefer (as measured by increased retention) the new subject line and thus we've kept it.
I agree that the new subject line does not afford for easy sorting. And with that, I've asked engineering to set you up with the old subject line since we still have the code. Let me know if everything is back to normal tomorrow!
All the best,