For example, I’m on Lemmy.sdf.org and I joined the Apple@lemmy.ml community. But there are many missing articles and comments. If I browse directly on Lemmy.ml for the same article there ~90% of comments are missing.
https://lemmy.ml/post/1152794 has 26 comments https://lemmy.sdf.org/post/11232 has 0 comments
Comments from before the first user subscribes simply do not sync. An instance only gets comments made after at least one user subscribes to a community.
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Yeah, I think it will change eventually, but there are some issues that make it hard to fix right away. Lemmy is basically beta software written by two guys that has been thrust into the spotlight by current events. There are going to be some growing pains, but I have hope that things will improve with time.