1.0 dungeons had some random elements at times.

They were removed. Players dont like random elements as a whole (despite what you read on the forums) and the Dev's when 2.0 was released were very focused on making the game "accessible" and used the term theme park several times in their description of how they wanted to frame the game. They said this was done to combat the evolving mobile gaming market, which is eating into a large chunk of their playerbase.

The idea is you line up for the ride you want, go through the expected course and get some tickets for a prize at the end. That is the core of this game, and it will not vary from this course unless and until it is is very dire financial straights.

Take it or leave it, the theme park weekly tome grind works for them right now financially and keeps players logging in. This is a safe MMO, they do the tried and true. Being the champions of accessible and relatively easy content that they are, I highly doubt they will release anything with random elements any time soon.