Hi, I help with Rejuvenation in general and notably for this case, buffed up intense mode in the past two versions.
As people've said, it's not for everyone. It's for those who think themselves good enough, or those who want to test themselves on a repeat playthrough. Furthermore some statements in the OP really make me doubt you know what you're talking about or how essentials(the rmxp based engine the game runs on) as a system works;
EVs aren't ever set until Crawli~Angie outside of Valarie's ace Primarina. Furthermore Essentials automatically gives evs in each stat if they aren't set by the following formula; [Level x 1.5 up until 85 evs]. Furthermore I'd really like to see the "banned moves/item combos" you're talking about since I really don't get that? As for the AI seeing items, that's a function in Reborn too and that's set to emulate the competitive scene where players can quickly guess what items or sets the opponents have. Take that up with them in that regard.
I don't quite understand how that Madelis fight was giving you trouble when we very much so held back to prevent progress. Either way there's a healing station and PC right outside of that place with some wild pokemon you can catch and grind on.
I also found your comment about ev training funny because I test and beat everything on intense without ev training at all.
There weren't any real other points brought up that were worth mentioning, that hadn't already been expressly taken apart by other people so I'll move onto something else.
I kinda don't agree with saying it's that much easier than Reborn? In a sense since you're used to the style of the game one could adequately prepare before hand but it's mostly designed to go along the same type of curve. Quite interested in hearing more in this regard.