A now abandoned Lemmy app starting with L had an option to add instances easily and then I could start seeing posts from that instance in the general feed.
Now almost any app has only options to add communities but not the whole instance.
I believe there still should be such an option hidden in plain sight somewhere and I am simply unable to locate it yet.
Where is it?
Liftoff (a fork of another abandoned app) did something that made inter instance operation really smooth. For example I used it back when Beehaw defederated LW and SJW. I had an account at Beehaw anyway so I would include communities from there in my main acct (sjw) feed. If I intended to comment the app would automatically know to comment from my other account that could actually interact with the content.
No other app has made it that easy. Sync lets me browse another instances’ local feed but interaction with a defederated instance doesn’t work.