I agree that the core reading experience of a ....ahem....
reading app....should be the downloading, display/rendering, and syncing of the reading position between devices.
Unfortunately, some people are never happy and continually push for their individual desired features. While I don't have a problem with that philosophically, I have a problem when people put down another's work when their request is denied. That kind of "negative encouragement" rarely works, and IMO falls directly in the category of bullying and verbal abuse. Once or twice may not be a big deal, just rude, but when you hear it over and over without stop - even in the face of direct denial from the developer - it falls into that category.
[not intended as calling out any individual or implying MR policies have been violated - just a general comment]
I would much rather give positive feedback on the stuff that I like, positive criticism on the stuff I think needs changing, and a polite request for features I'd like to have added. If the developer decides not to indulge my request, I won't go whining to everyone and start putting down the app.
BTW, I won't say I told you so, but I'm glad there weren't too many people jumping on the "Marvin is abandon ware" wagon... I will just be quietly vindicated 
Ooops...did I say that out loud?!?! lol