I’m not sure I need Surf.
I already use and love the app Tapestry to pull my Bluesky, Mastodon, Pixelfed, Tumblr, and Threads feeds into one place. I also have micro.blog for publishing my stuff to one canonical place and sending it out to all those social networks (POSSE: Publish on your Own Site, Syndicate Elsewhere).
If you don’t have something like micro.blog, I can see the benefit of the reverse approach (PESOS: Publish Elsewhere, Syndicate to your Own Site). It means you can publish on the various platforms and Surf will pull it into a destination that you can share with new audiences. Likewise, if you don’t use Tapestry, I can see the benefit of using Surf to aggregate your feeds.
The publisher case is less clear to me, though.
The Surf beta has launched with outlets like 404 Media and The Verge on board. For them, it could make sense as an audience consolidation tool. But if readers stay inside Surf browsing snippets, will it drive traffic back to their sites where the ads/subscriptions are? Publishers have been burned by that trade before on Facebook, on Twitter, and on Flipboard itself. I am not clear how this new approach will be any different.