rss feeds are primarily updates to let you know when there’s something new on the website without having to go back to the site. They’re not necessarily to give you the full content of the article so you do all your reading in the rss reader

There are some that can do that, although mainly on subscriptions rather than free versions

Inoreader (my personal favourite) NewsBlur BazQux lire

FeedFlow uses a kind of workaround in that it loads the page in reader mode in a browser, which I think works very well.

I might have misunderstood the intended use for this, but is there any way to connect a mouse or a monitor? From the picture gallery, it seems not, but I could see myself using something like this without the monitor and the mouse while I’m out and then connecting it up when I’m home.