Hey, RMS, Abelson, Sussman, Steele, Guido, Larry, Matz, Richard Gabriel, ESR, DHH, Flatt, and Felleisen, it turns out you're not true programmers! Okay, cool.
Needless to say, I claim No True Scottsman.
In this case, I half agree, because I think mobile development is best done using native platforms. But if you're doing web development, JavaScript is a must. And React is an elegant way to handle browser UI (Flow/Redux is also quite nice way to handle browser state, if a bit verbose).
I do share his concerns about the patent clause, and about Facebook's long-term commitment to the project, but at the level of personal projects, these concerns have not been enough to scare me away.
Right. And JavaScript is not that language, unless you are doing web stuff.
Do I hear an echo in here?
"I think mobile development is best done using native platforms. But if you're doing web development, JavaScript is a must."
For complex applications I'm as leery of it as anyone else.