This thread is 19 pages..with the highest post per page settings, I shudder at what this page count would be on default settings.

Also, as I said, if we're to add scaling to content do it this way:

Solo/Easy - Obviously easier, no reward.
Default (varied difficulty given specific fight) - Original Challenge, default rewards
Hard - Obviously, harder with higher chance of rewards and even extra rewards (Varies from Exp to more items or seals)
Very Hard - Obviously, even harder with very high reward chance as well as 100% more extra rewards.
Nightmare (gogo Ys) - Hardest difficulty which causes all strategies to be changed, highest reward chance and even an additional cutscene for beating (content).

Otherwise there's no reason to allow scaling if absolutely nothing changes but being able to kill it quicker and potentially removing TP moves or how much damage it does.