I think both of these exist? There's a way to turn off retweets for particular users (it's in the same menu you'd use to mute or block someone) and there's an option to show a plain timeline (uncheck "show the best tweets first").
The plain timeline option doesn't seem to consistently work on the mobile app, but many (most? all?) alternative Twitter clients show you the plain timeline.
Twitter is pretty simple fundamentally. It is just the feed with some notifications for 90% of the UX. I just want a different kind of primary feed that reflects what it used to be about. Even it's just a tab on the feed. Like how Reddit has "Home", "News", and "Popular" tabs, I just want the home tab.
I have very limited connectivity and spend minimal time online, twitter is time wasted for me.