If I send this to my partner, as I do with a lot of things we both enjoy, they will be able to read it, but not reply/respond, as they don't have a lemmy.ml account. The post ID for the same post is different via lemmy.world, obviously.
We send each other links like this all the time, and on reddit or hacker news, that's not a problem. There can be only one HN, after all. Lemmy is not so monolithic, and it looks like this is a serious downside.
I can't reply to other instances than my "home instance", and I can't easily discover what the post ID for this post is on my home instance, so my interaction/"engagement" is probably going to be very low for things I didn't discover myself.
Since you typically do this with your partner, the easiest solution would be for you both to be on the same instance. Then the gray chain link would work fine.
For other random people, use the colored federation star link. That goes to the home instance of the post.
Edit: as per mortonksalt
Another option is to paste the link to another instance into the search on yours. That should bring up the local instance version of the same post.
Hi, I'm the partner. Isn't it possible to create a converter that detects what instance you're logged in to and then redirect to the post? //noob frontend dev
They say you should be able to put the linked URI into your instance search and pull up the local version of the same post. That isn't super clean, but it should work.
Honestly, someone should just make a browser add-on for this, and that would solve the problem for a large chunk of people, since most users appear to be techies.