The feature relates to a problem I've encountered as an active intermediate developer with managing the multidunious and varied queries that i might do both getting up to speed and solving problems in-the-wild. I find that what i learn and use doesn't stick right away, so rather than making the same query (and in this case sometimes getting different results) resorted to keeping 3 notebooks for each subject: a technical reference, a working notebook, and a learning log. That's a lot of notebooks!
I mention this because knowledge management and effective learning go hand in hand. And learning something you didn't know seems to be the problem domain of ai search for developers.
Organizing query results thematically by learning trees would be a gargantuan undertaking, and probably far outside the scope of what is already an excellent service. Just putting that out there.
Thanks!
Personally I hope it ends up either freemium or with a reasonable price ideally token based. I very much want to pay to incentivize development of good products but I already subscribe to enough things which is why I hope for more token based services.
(Of course if something is good enough and the pricing is reasonable there are sometimes room for exceptions. Kagi and Telegram are the latest ones for me and only Kagi is "safe", Telegram is mostly as a way to express my gratitude.)