Unless I am missing something, the bullet point near the end, "Progressive rendering", is not correct when it states that template rendering is asynchronous and parallel. Fetching of data, sure, but unless they are using web workers to execute the templates client side, and I do not see workers mentioned anywhere, this is not accurate. When a template is rendering, all other JS and UI will stop.

Having applied the same approach as LinkedIn on past projects and jobs (e.g. BN.com), there is definitely a lot to be gained if done right, and web workers, when available, ease some of the issues with rendering large templates and/or large datasets.