> For heaps of this size you can use Shenandoah GC and you get pauses well below 100ms. Your post is a perfect example of the type of 'historical reasons' (or historic FUD) the GP talks about.

This GC is relatively new, and Elasticsearch doesn't support it (https://discuss.elastic.co/t/support-for-shenandoah-gc/16237...)

It may be a potential solution, but it's hardly a proven one. The concern is not FUD, it's legitimate.