I knew I wasn't dreaming. I could have sworn I read someone on GAF putting something similar to the Must Style mode in that DMC5 thread.
http://www.neogaf.com/forum/showpost.php?p=142947916&postcount=72
Also another post in that thread :
The whole concept for "Dante Must Style" mode came when DMC3 leaked and people on Gamefaqs were like "oh man DMC3 DMD mode is so hard... you don't do any damage to enemies unless you are S or higher!" People actually got hyped for it but as it turned out enemies just had a fuck ton of health and having more Style rating didn't impact this.
I thought it would be cool that instead of having tanks for enemies that their health depended on the Style rating. This would force players to be more creative in their combat rather than relying on the bread and butters.
Here would be my additional difficulty modifications on "Dante Must Style" mode:
*Style gauge builds up slower but goes down faster. Repeating a move instead of retaining neutral style would cause heavier decay than normal.
Like I said first time I heard of this mechanic was in DMC3 as a rumor and then it just stuck from there. After that I only really heard it on GAF a couple of times and it was really myself who advocated it the most.I've never seen the May Style mode suggested before either. Even back in the GameFAQs DMC3 days I don't remember seeing that, and I distinctly remember stuff like God Must Die being suggested tons of times.
Hopefully stuff like hardcore and Gods Must Die is balanced properly. Nevertheless I'm gonna be playing this like no tomorrow.