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JavaScript VMs are quite fast, actually. They get a lot of attention.

But developing in JS is consideray slower than in Ruby, and time to market should be king.

> time to market should be king

Eh, not really.

On a mobile device, efficiency should be king... that's not exactly Ruby's forte

I'm skeptical of your first point as well

How does backend development reflect on mobile?

"Ruby could have been Swift"

Swift's raison d'etre is mobile development

V8 is a work of art <3

What do you like the most in the V8 internals?

It's not nice to pick a favourite child. Though something I heard about recently that made me happy (less about V8 internals) is how they try not to improve compilation speed by not compiling. There isn't a video about it yet but you can stalk https://2020.programming-conference.org/details/MoreVMs-2020... when it exists