I also use Readwise Reader and the speech update they dropped a month ago made great strides towards AI reading.
It’s just missing some UX improvements now, mainly the ability to continue playing across multiple articles. It’s also not smart enough to skip boilerplate junk that appears on top and bottom of every newsletter, which is easy to skip over visually but a pain when read out loud.
A while ago, Amazon tried adding TTS to kindle and got immediately slammed by the publishers, so they withdrew it. However, with the current state of AI, I think users will start to demand it as a standard feature of anything they’re reading. Not only can it read at human-like capability, it can do so in any voice theoretically. Soon you’ll also be able to pause it and ask questions about what it just read or to summarize the rest of the article and so on.