Earlier quoted context omitted.
i consider emojis as the tonal element missing from text think of it as visual intonation (o) (o) https://en.wikipedia.org/wiki/Intonation_(linguistics)
I like your interpretation which ascribes intelligence and meaning to other peoples' behavior instead of the grandparent which seems to imply that the kids these days are just stupid and don't have any interesting thoughts to convey. You can't find the meaning in other peoples' behavior if you just assume it's meaningless from the get-go.
i am unable to speak for middle eastern or cyrillic languages due to a shameful unfamiliarity, but as for western and a majority eastern languages, the core of the japanese language is substantially, yet casually, more capable
japanese is comprised of three alphabets:
kanji : an enormous, complex, and ancient chinese character set
katakana and hiragana: syllabic runes that bridge japanese phonemes to its own complex characters or even other languages
the japanese even created a phoneme set using latin characters called romajithe japanese have a japanese numeral system but also use arabic numerals
what's more is these elements of the language can all appear on the same poster one walks by while walking down the street
and yet still more, those elements can all be meant to be read in different directions
japanese texts are written horizontally and vertically
japansese books can be printed and read either page flipped right to left, or similarly to the west, left to right
one may argue a dislike for or refuse the use of emojis but it could be said that one of the most literate cultures in the world looked at their tools of communication and felt them wanting