I'm not sure I understand what you mean by reading the feeds as they are, but rawdog doesn't do anything to the feed content except wrap it up in div tags for inclusion in a local webpage.

At one time I had made a modified version of it that stripped out all but the first few lines of each feed entry, but I lost that when I made a mistake backing up my files before a system wipe and fresh install a few years ago. So if a feed includes the full article, that's what I get in the resulting page. Or if the feed has only a summary or a title for each entry, that's all I get for that one.

For screenshots and more info re the unfortunately-named rawdog, see https://offog.org/code/rawdog/.

But I take jkl's point about synchronization. I don't do much mobile computing myself, so I get enough "synchronization" from making one of my home machines a webserver for those rawdog-generated pages. But I can see why some of you might prefer a cloud-based solution.