I guess what I didn't get is: doesn't this new feature purely add, not detract, from someone's capabilities?

So like, if you strictly wanted to read just the comments from the original community, then you could just stop at the gap where those comments end and the comments from another community begin - unless you are worried about FOMO due to seeing them and then feeling compelled to have to read them (all)?

Or if you wanted to read only let's say half of the communities (but then all of the comments from each of those), then you can still do that? And now there are even two ways: to use the old method of accessing the cross-post menu and going to each community individually to read those, or the new way to hop and skip and jump all on just one page (this one admittedly isn't so ideal just yet, without the ability to simply skip down to the next).

So, except for perhaps FOMO, what is being lost here? And isn't this pretty niche, since someone can always just block the "bad" communities and never have to see them again, so that the difficulty here lies in both preserving them to show some but neither all nor none of them? That seems a more nuanced thing that isn't likely to just spring up out of nowhere, as this initial feature did.

Well, it's not like I'm even disagreeing with you there. Your suggestion does sound nice, and would be helpful to have.

Although I will say that I disagree that it will necessarily cause centralization of comments, or at least not entirely. For one thing you can respond to any comment, so this only affects top-level comments, and for another, subscriptions have those different implications on PieFed than on Lemmy, so e.g. I often do NOT subscribe to Lemmy.world communities such as politics or news, since that way they do not show up in my Subscribed feed - hence, all my top-level replies will be definition not be located there - and yet I can still see posts from these communities in the Topic/Feeds if I desire, and now I can also see comments from them.

Perhaps I'm just being a pendant - or I felt more like we were "exploring this space" verbally:-) - where what you are saying isn't "necessarily" a given, and yet indeed this may encourage certain pre-existing trends, especially for those who aren't forewarned or forearmed to resist them. And yet we still haven't arrived so much at a (potential) "solution", except to simply turn off the feature at the instance level, which will still allow those pre-existing trends to continue as they were, while also not helping with all the new things this offers such as helping people discover new communities, e.g. outside of Lemmy.world, that they probably had no idea even existed:-). i.e. yes there is a cost to this new feature, but there are also costs to not having it as well. And the costs to me seem small - bc again, someone can simply ignore all of these extra comments (except for FOMO?) and stop reading after the primary set, while if this feature did not exist then it would take a lot more time having to hunt through and read all of the comments from each community individually - which I used to do, which is why I'm saying that I LOVE this new feature!:-) But... maybe an option to disable it offered per user account would be sufficient to help improve it for you? If you can pin down something that doesn't take a lot of effort, you could submit a feature request for that?