Wow, there's a lot of fear of the unknown going on here. 30k units are nothing to fear guys anyone can find holes and abuse the system but 30k armies have less access to this than any 40k army.
There are quite a few people who have expressed interest in playing their 30k armies and they keep getting shut down by fear mongering and TOs. I created a narrative way to incorporate 30k into our campaign so they could have a place to play with their models and maybe put an end to the fear mongering. I have read the rules for most 30k armies and there is nothing broken about them unlike in 40k. If a bloodthirster isn't broken then neither is a primarch that costs 100+ points more.