Invisible characters are there for visible characters to be printed correctly...

I'll grant that a space and a newline are necessary. The rest, nope.

	▲	abujazar 2 hours ago \| parent [-]
		You're talking about a subset of ASCII then. Unicode is supposed to support different languages and advanced typography, for which those characters are necessary. You can't write e.g. Arabic or Hebrew without those "unnecessary" invisible characters.