Programatically render a view in twig template
Right, twig no longer allows you to execute php code anymore. This is a main feature of twig and its security model.

I'd suggest to use a preprocess function for now and there call the function or even better add a render array with #type view, with #view_id and #display_id, as it gives you caching as well.

On top, maybe add an issue against core. That sounds like a really helpful thing to have

Oh and views_embed_view should be changed to enable caching as well.