since the need for DM’s would be relatively niche
Do you think so? I'd personally would prefer to not have any comments in the public threads. So, I'd like my comments to be sent as DMs to the OP just to let them know about the conversation on Lemmy and to encourage them to signup here. Don't forget that the main goal is to make it easy for people to migrate away from Reddit. If we just implement a two-way bridge, we'd be effectively giving no incentive for Redditors to move out.
My thesis is that content is king. There is a good number of people who are on Reddit not because it's their favorite platform, but because they can't find the content elsewhere.
If we mirror the content on Lemmy, then Lemmy will have the same content as Reddit, then the "lack of content elsewhere" stops being a problem, and then these people will be "free agents".
If we have content here, the "problems" of Lemmy are not going to be seen in such a bad light. Conversely, if Reddit does not have exclusivity of the content, people are not going to feel the need to put up with all their crap.
Having a "two-way" bridge is not necessarily bad, but the more we have people saying "look, someone responded on , to respond, signup via " it will start creating a situation where people will be realize that they can choose between:
I am treating those in the "I will be annoyed by a bot asking me to migrate" as "people who are loyal to Reddit and not willing to move away", so the sooner they block the bridge, the better for everyone. But again, my thesis is that these people are not so numerous as the ones that will just move to the platform that provides them the most content.