I have plenty of other ideas for what to build on top of it: offering an SDK and APIs so you can vibe-code the UI you want, a built-in podcast listener, using news from aggregated feeds to build a personalized AI feed. But the first step is to reach the Google Reader feature set minus social features.
API access is worth chasing. There was something I wanted to do with Feedly (I've already forgotten what it was) but once I saw their APIs were hidden behind some enterprise level plan, that was the end of that. If we're in a world where everyone has a personal AI agent, giving their agent an API key to their RSS sync account... that might have some interest.
Feedly seems hostile to third-party client access (ie mobile & desktop apps), so being friendlier towards RSS clients could be of interest.
Personalized AI feed is a good idea but you don't have all the personalized year of context that my Claude does. My AI agent is (probably) going to do a better job of choosing the most relevant stuff.
And personally, less interested in podcasts in my RSS app. That's something for Pocket Casts / AntennaPod. I like my audio separate from my RSS. But that's me.
Best of luck though, I think this is a very promising space. (But my bet is you can do all the interesting stuff in vibe-coded thin UI + OSS pipeline.)