There are much better sources for Primal Chaos than Paragon chests. Because first of all you need to get to 25/30 renown where you can earn Paragon. Which is where you will probably have already earnt enough Primal Chaos to craft whatever you need and enough to send them to alts.
But not arguing whether they should be in there or not. I’m just arguing that the Paragon Chests rewards should be better for everyone. Rank 3 profession stuff would be good, and more gold is always useful.