[SFjulie1]

No language other than C and FORTRAN have correct numerical libraries with a decent amount of speed.

Would you like the next plane that will make you travel to have the math done in javascript?

Would you like your pacemaker to fry 17W/h for a V8 engine and do you need mozilla embedded in it ?

Would you feel safe with nuclear plants control on the cloud?

Does a space probe rather needs support for an oauth2.0 or correct numerical analysis?

Don't you care that banking systems are correctly translating numerical amounts?

I mean computer are used for critical purpose too.

EDIT PS: numpy in python is binding on fortran libraries to do the job.

[cballard]

The idea of those things being built in a language without memory and good type safety (no ability to cast everything to void*) should terrify you.