Thanks for the kind words re. Maelstrom.
Fun fact: I pitched my Maelstrom to AdeptiCon as potential Champs missions for 2016, as an adaptation of 2015's full-deck Maelstrom. They decided to go a different direction, dropping all elements of Maelstrom from champs missions, but gave me green light to run a small event. I believed that I had found solutions to the biggest problems of full-deck Maelstrom and really wanted to see it played. Glad you enjoyed it.
There is little point arguing that the most popular 'form' of 40K right now is multi-detachment. At the same time, I think there is little point arguing that the most abusive (where abusive = having access to, and using, the most imbalanced units/rules in the game) 'form' of 40K right now is multi-detachment. Please note that I don't say 'most imbalanced form of 40K'; imbalance is inherent (at the codex and unit level) and unavoidable. But abuse can, to some extent, be mitigated by limiting the number of detachments. Does it result in more 'fun' or more 'variety'? I don't know. But I think it does cut down on some serious cheese.
And it's true that you used to have to get into the champs right away, but back in the day the Friendly, the Long War Doubles and the Horus Heresy events either didn't exist or weren't very big. All three of these events are sold out, with waiting lists. The HH event has a waiting list that is bigger than the number of slots allotted to it in the first place....