Actually it's almost the other way around. As we move through beta it's necessary to be stricter on what things can be changed. To pick a couple of examples (by no means the be-all and end-all, just illustrative):
- We need all the specials testing soon so that if there are problems or overhauls needed then we have a shot at changing the functionality. Given it takes some time to design & implement the change, time in QA, then bundle up into the next release and wait for bugs/feedback. Potentially with more than one loop around, each taking some number of days.
- Exactly what % bonus a specific recipe can give is an easy data change to make with very low technical risk, similarly for how much rep crafting gives you.
Bringing Mayhem in sooner means we have a better chance to nail down the former kind of question

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(Edit - spelling)