I have similar concerns. I really used Pocket a lot. Two times I got an e-mail at the end of the year that I'm in the top 1% of their users. That was nice!

I want distraction free reading which means no social recommendations, sharing and other stuff. Things I would really like is pdf support, x days of reading left, auto scrolling and detailed statistics about my reading. Also cool would be some garbage collection, e.g., news articles are useless to read in 2 weeks but a blog post may be still useful in a few years.