That's a waste of a manual refresh action - if you only open the reader when you want to read something, there is no point in not auto-refreshing on open so you can... read something.
> I can mark everything as read and get back to a neutral state. And just like that, I’m done with my timeline. Isn’t that amazing?
Not really, you've described a workflow with the same "FOMO" and "chore" downsides: you have to invest time into reviewing the whole batch of downloaded content otherwise if you mark everything as read you fear you've missed something important that you haven't reviewed it. Some clients can even auto-mark links on scroll so you reduce the risk of mislabeling, but these are still not refined enough controls to tacke the issue.
(and yes, of course there are ads in RSS)