Agreed - it's not a given. that's the point - the puck /isn't there yet/. But if you were going to pick the next thing after Backbone, Angular and React, Svelte is your best bet.

I picked Linux when everyone used Solaris.

I picked Python when everyone used Perl.

I picked node when everyone used PHP.

I picked virtual DOM frameworks when everyone used Angular and Backbone.

Feeling confident picking Svelte.

This is a nonsense claim. We don't provide an 'officially sanctioned' way to test components because we think that unit testing components is usually a waste of time. But Svelte is no less testable than any other framework