I’ve used this before, and it sounds like it’s pretty much exactly what you’re describing: https://mailbrew.com/ Think I heard about it through this sub - I remember I could choose for it to send me “x top posts in last 24 hours” for 3-5 subreddits or something. May be worth checking out
I don't use Twitter RSS feeds but accomplish the same thing using a paid tool called Mailbrew (which is also my main RSS reader app BTW). There I follow a couple of Twitter lists I've set up as well as some aggregations provided by the app (top tweets/links - kind of similar to what lindylearn is doing).
I can't recommend enough https://mailbrew.com
You configure the sources of the news you want (subreddits, hacker news...) and then it will send you emails with the 'top stories' on a regular basis (you can configure, weekly, daily...).
It really stopped my news addiction, because now I no longer have to navigate websites specifically designed to get me hooked.
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Fun fact: My daily 'brew' has /r/minimalism as a source and I found your post reading it :)