That's good for you, but it sounds like you're extrapolating it on just your experience rather than research? Perhaps you've been lucky? Do you really have the info to objectively state it as "simply not true"?

Read the jepsen tests (old but show core problems that aren't fixed):

https://aphyr.com/posts/317-call-me-maybe-elasticsearch

https://aphyr.com/posts/323-call-me-maybe-elasticsearch-1-5-...

Or just search for ES data loss:

https://news.ycombinator.com/item?id=9475620

https://stackoverflow.com/questions/29841348/how-reliable-is...

And if that's not enough, here's the official page listing several "ongoing" fixes for major durability issues:

https://www.elastic.co/guide/en/elasticsearch/resiliency/cur...