But from reader perspective, RSS is awesome. You don't have to deal with all the email subscriptions double opt-in etc. The ability to unsubscribe/resubscribe in one click is fantastic. And you have number of good RSS readers to fit your need.
Pro tip: you can add “/feed” to any Substack publication to subscribe to its RSS feed
To my surprised, RSS is still my most requested feature for my little SaaS[0]
I wrote a short blog post on how to read RSS on Kindle here[1]
[0]: https://ktool.io