One could argue that it's just what's old becoming new again. In older English capitalization of words was often used to add emphasis or imply meaning beyond what could be conveyed in a sentence by itself. For instance from the Declaration of Independence: "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."
I don't actually know why this faded and got gradually replaced by our quite specific rules. It seems like a nice way for an author to be able to express much more meaning in the exact same number of characters.
> It seems like a nice way for an author to be able to express much more meaning in the exact same number of characters.
Quite the opposite: It damages beyond repair the ability to pick out proper names at speed.
English has a horrid habit of re-using common nouns as names. The miller John becomes John miller, not John Miller.
Worse, the proliferation of brand names means that readers depend on capitalization to know if they are talking about, e.g., google, a common generic term for searching, or Google, the Alphabet (not alphabet!) subsidiary.
So, under the new regime, authors get to be more precious at the expense of their audience's time and concentration.
That's a Nope from Me, Dawg.