I mean emojis specifically. Python or JS strings are designed for unicode chars. Swift made it about grapheme clusters, which are possibly a valid edge case for like Arabic emphasis marks but not something they'd be motivated to center the entire strings behavior around if it weren't for emojis.

Weird part is the Swift way was still annoying even in cases where I wanted to manipulate strings with emojis very often. Had to build some custom pre-indexed string (just an array of 1-cluster Swift strings), cause find/replace/split/etc was too cumbersome and inefficient otherwise.