text - On feeds, should newer items be at the bottom or the top?

I make feeds for a living and unless I'm mixed-up, on all the feeds I can think of, from Whassapp down, of course new items appear at the top of the page, the top of the list. (I.E., the old items move down. So on a feed you push the content up with your finger to see older posts. You pull downwards to see newer posts, with ultimately the most recent at the very top. {Indeed you pull down "even further" to typically refresh.})

But it occurs to me. Text in the West grows downwards: "newer" items are, of course, at the bottom. If you're, simply, say using a text editor to make a list of notes, a diary, or TODO items, of course it "grows downwards" - the newest stuff is at the bottom, and when you add one it's at the very bottom.

So,

i) In fact are there any major examples of feeds (feed apps, social apps, social in-browser apps, etc) which indeed grow by adding on the bottom? (Newest item is on the bottom; you push up (exactly like any text at all, any typed page) to see the newest stuff at the bottom.)

ii) Has this issue been explored? Is there a reason that (unless I'm mistaken) new is always on top?

iii) In fact should the new item be at the bottom? Any obvious woes I'm missing or any thoughts?

iv) Why (what cultural, technical, historical or accidental reason) is the new-at-top seemingly dominant in feeds??

(Note that certainly on device apps, the bottom is "always there", since the window is the glass: sure, in a web browser you could maybe "not see the bottom", you tend to "see the top" of a web page: of course these days you could shape it to the local height of the page ("just like an app"). Indeed perhaps, is the only reason we now apparently traditionally put the new item on top in a app feed, that, traditionally on a web page you see the top, not the tail?)

Answer

Perhaps the most notable example of a feed where the newest items are at the bottom is forums. Although not a "feed" in the very strictest sense of the word, forums wouldn't work any other way. In my experience, whenever context demands that you have read the older stuff first (like forums), then the new content is always at the bottom.

On the other hand, this is certainly not a rule. Take text messaging applications, for example. I've never seen one where new text messages came in at the top, even though texts tend to be short and spaced out through time such that it would work perfectly fine flipped.

So I guess my point is that in things like news feeds where one item is unrelated to the next, all the user cares about what is newest, so the newest content is made prominent. But where context is necessary and the old is just as important as the new, the new stuff comes in at the bottom.