And what are the practical implications of their supposed "moral responsibility"? How do you want to sanction them if you think they neglect it?

Bitcoin is the epitome of individual responsibility. You can't go crying to some stranger on the internet who wrote code that you chose to run. You can't complain that you're not being communicated to in a way you prefer – getting information is your own responsibility. The mailing list is there, Delving is there, the GitHub project is open, and if you don't have time for all that, a bunch of busy contributors set aside time to produce a weekly newsletter to summarize everything for you, and if you don't even have time for that, they make a podcast version of the newsletter.

If you just don't want to try to understand the technical aspects, your opinions on technical aspects don't weigh particularly much. I'm sorry that's harsh, but bitcoin doesn't let us ignore harsh realities.