Hashtags are great, until they get spammed. For example, #grownostr used to be for interesting non Bitcoin content, looking to talk about things other than Bitcoin. It was great! Now it's spammed with random content non stop all-day long. It's still technically growing Nostr beyond Bitcoin, but every single note shouldn't include the hashtag. TLDR, hashtags are cool until they become popular, then they're worthless.
Discussion
Yes, its true, but untill that happens i think it can have a good use case, and nostree lists are not as common as kind1 notes, of course can happen too, but can be interesting see how advance, and the potential benefit for new users can be good. Just encourage you to create a list of interesting resources to learn nostr and other references to newsbies and publish it in a nostree list with the hashtag nostr and others that you feel suitable for this objective. I think you are a good transmitting the knowledge to new users 🫂