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How would they work? If you click on them in the title, would it open the post or the hashtag?
Ideally it would be a discoverability tool for Lemmy's side to broadcast to the whole fediverse. So if you post a title like "Hey #nfl fans. [email protected] is hosting an #ama with @[email protected] at 2pm EST." The hashtags show up on Mastodon. The [email protected] would take you to the sub. Or if you wanna see just Tom Brady's answers you can click his name and find his answers. From our side on Lemmy we have the thread structure down. So that's all you have to do is title that and put whatever you want in the body. From Mastodon's perspective they could turn their content warning system into titles. So that title would be the content warning. When you click on it, it opens the body of the post, including all comments and replies. That way you have discoverability. You have a way to interact with the post from anywhere. You complete the triad of person, place, and thing so everybody has full context of what's going on. Lemmy users would get full functionality of Mastodon in Lemmy fashion and vice versa.
While it probably would help people on Mastodon find content in some circumstances I'm not sure it is necessarily a good idea. They can already follow sublemmies, communities so that is an organising principle. It might be a case of trying to do too much and confusing people. Exactly what conventions will be used by people posting from Mastodon into the lemmyverse and vice versa are not yet clear so maybe deliberately using conventions from one platform on the other will develop. Will be interesting to see how things play out.
By the way when viewed on Mastodon this hashtag is clickable unlike some hyperlinks posted from lemmy; it is not showing up in search though(on https://masto.ai)
I think the one convention that needs to be fleshed out is differentiating between place and person. On Lemmy we can use [email protected] to go to different communities. On Mastodon it's @[email protected] to find those communities. The difference being that Mastodon treats the place as a user. Because of that you get funky cross contamination between two separate ideas on Mastodon. Here on Lemmy you go to that place, but on Mastodon it pulls up all the individual comments and replies from that place. They're out of context because those posts are pulled from some random point in a Lemmy thread. It's like pulling all the content feom a community here and playing 52 pickup to find contex. You're losing the organizationof the full thread experience. And if you look at the profiles of communities from Lemmy at Mastodon they're being marked as groups. So we know there's structures in place to differentiate places from people. It just has to be agreed upon by the website developers on how to implement it to make a smoother experience.
Mastodon has the infrastructure to do the full title/body thread experience. It's in their content warning system. When you put up a content warning on Mastodon you can give it any title you want. Then you type out the body and people reply like any old reddit thread. So it's not really a matter of changing infrastructure to match one site to another. Mastodon can stay a Twitter replacement and Lemmy a reddit replacement. It's really coming to an agreed upon way to navigate it. And that would be done in the person @, place !, and thing # way.