I wrote and have been been using my own feed reader, Temboz, for over 24 years now. The two essential features of any good reader in my book are:
1) filtering. Don't want to hear about the inane Kardashians or the insane Trump any more? Double-click on their occurrence, click "thumbs-down", adjust the filtering setting and boom, mental health restored.
2) giving you control over the order articles are shown, as opposed to the Meta or Google algorithm that does not have your best interests at heart.