Google Search — As per experiment, Crawling and Indexing is completely unrelated to Fetch & Render or even Google Cache. So when Google says everything is fine and we can crawl javascript — that’s not true, not the case in real world with many actual websites. They either unable to do it as quickly/easily as html or it costs them too much to do perform a robust crawl.
Google News — They have their own crawler and their team told me they can only crawl html. If this is our main problem, it would explain a higher drop in newly published articles that rely on getting picked up within seconds.
Other Search Engines — Can’t render JavaScript.

Links to sources mentioned:
Angular SEO best practices —
Angular Server Rendering —
JavaScript SEO experiment —