Well i guess this is when @GrizzleMarine and I pipe up about the experience.
Before I get into it, Metamorphosis was a great experience, and alot of fun; HOWEVER it is not ready for commercial release.
The delay means no additional content, XML Updates are allowed (balancing and what-not).
Ignoring the issue above, with why this cannot be released into Evolve. Steam users tend to get upset with content being released on their system, that will not have future product support. The solution to this, would be dedicating some of the resources from TRS to finish/polish off metamorphosis.
This exists, evolve has it aswell, just not in the public release.
Almost 100% of the content in metamorphosis exists in evolve, in some way or another.
Steam incorporates a playtest system for all developers. It would be logical to assume that Evolve has a playtest where TRS can upload a patch to ensure that it works properly with steam, at a minimum.
Releasing additional content and dedicating corporate resources to polish off the content, would only remove other future content. TU9 is currently complete, and the longer it takes for TU9 to finish, the more content TRS will be adding/including with TU9.
One of the biggest complaints from You-tubers such as , was that they were unable to find/hunt the monster. As @GrizzleMarine mentioned in his most recent video. The maps in metamorphosis are on a completely different level. The idea of 10x the map size, may have been an understatement. This would only makes these complaints more eccentric pouring gasoline on the fire.
Overall, I loved being able to play metamorphosis, and I thoroughly loved the experience. Chris Ashton did a great job teaching us the bare mechanics, and even tried to make sure that us noobs (@GrizzleMarine and myself), didn't get lost (which we still did). The map was gorgeous, the wildlife was CRAZY awesome, and the entire universe that it created, was unique to itself. I truly loved the experience, and it was wonderful. But if i had to choose between TU9 being larger and containing more content, OR Metamorphosis. I would choose Evolve, without a question.
and it, is glorious.