It’s so much more obvious to make a statement sound insane or to use /s.
Also, would most of the world even interpret that emoji as “eye rolling?”
You only interpret ‘\s’ as sarcasm because of html and sarcasm beginning with the letter ‘s’. If you don’t think pictorial eye-rolling ‘looks’ like sarcasm, just consider it almost like hieroglyphs.
…that is much older than Twitter:
(This symbol is an abbreviated version of the earlier /sarcasm, itself a simplification of , the form of a humorous XML closing tag marking the end of a “sarcasm” block)[https://en.wikipedia.org/wiki/Tone_indicator]