I tried using it for a bit in my notes in Obsidian, but found it annoying, unnecessary and it added an extra mental load.
Wikipedia doesn’t do it in their articles:
Do not capitalize the second or subsequent words in an article title, unless the title is a proper name. For multiword page titles, one should leave the second and subsequent words in lowercase unless the title phrase is a proper name that would always occur capitalized, even mid-sentence.
This convention often also applies within the article body, as there is usually no good reason to use capitals. Outside Wikipedia, and within certain specific fields (such as medicine), the usage of all-capital terms may be a proper way to feature new or important items. However these cases are typically examples of buzzwords, which by capitalization are (improperly) given special emphasis.
https://en.wikipedia.org/wiki/Wikipedia:Naming_conventions_(capitalization)
So I went and changed everything for my liking.