Personally, I am planning to wait for all the catalysts to be available before completing the higher difficulty version so I only have to run it once, or in as few runs as possible. In fact, I would run a lot of recent seasonal content that way but unfortunately there are a lot of spoilers out there so I need to at least complete the story each week, otherwise I would wait for that too along with any bug fixes that inevitably arise. Time gating or not, it won't help their numbers as much as they think when players can simply wait to binge it all at the end of the season in that manner.