Yes but quite doable. Too much to do on the fly on the front end, but the heavy lifting can be done ahead of time on the back end.

I built a front end demo using only two data inputs (follows and mutes) which is how I realized it’s too much for the front end. nostr:npub1manlnflyzyjhgh970t8mmngrdytcp3jrmaa66u846ggg7t20cgqqvyn9tn streamlined the download process into a single click and you can try it out here:

http://grapevine.my

It will output the top 1000 recommended pubkeys minus the ones you already follow as a NIP-51 list which you can upload to a few clients (Coracle, Amethyst, nostrudel maybe?) and browse the feed when you get tired of you follows feed. Great way to discover new high quality follows.

 nostr:npub10npj3gydmv40m70ehemmal6vsdyfl7tewgvz043g54p0x23y0s8qzztl5h and nostr:npub1manlnflyzyjhgh970t8mmngrdytcp3jrmaa66u846ggg7t20cgqqvyn9tn and I are working on replicating the above but calculating scores on the back end using a relay that already has follows and mutes data, so no need to dump all of that onto the browser, much better UX.