About 20 years ago I spent a while writing a server to do a bunch of automation and reminding and so forth, and found that I was spending more time on that thing than I was doing real work, so I ditched it, just like I did OneNote and all the other apps. There's no need to fix bugs in a text file, nor do you need to upgrade your version of Python or whatever.
Simple will survive decades with zero effort. Complicated pieces of code (especially ones that use networking or browser tech) will need to be maintained, patched, debugged and ported. Life is short. I'd rather actually be productive than have to spend time keeping some productivity app running, or worrying if the vendor of the online notes app I chose to use is going to be bought by Oracle or something.
Actually in the past I used my email account as my RSS reader. It had integrated read/non read status, mass "mark as read" as needed, was synced on all platforms I cared about without anything to install. I didn't really changed my subscriptions a lot so configuration was not complicated.
Sometimes a webmail is just a good enough UI for text-related things.