When Zun made SoEW, did he know what "Easy" meant? I'm pretty sure stages 1 to 3 are MUCH harder on Easy than on Normal. I don't remember a lot of those stages on Normal, but I know I didn't have any trouble with them, save the stupid death I get every time because I fail notice a bullet. On Meira's last attack phase, she starts throwing bouncing balls of doom. There were 6 when I played on Easy, and I don't remember ever seeing more than 4 on Normal. Also, the lasers attack phase of Boss 3 (the ship/tank thing) seemed much faster on Easy.
At least Marisa and Mima felt easier than on Normal, so Easy mode might still be easier than Normal, but still, WTF.