Ironically, they added a massive hint right in your face for mechanics that used to be identified by looking at the attack name (Ghost/Fleshbuster) or boss stance (tri-birb and its beak) so you can't really say that has been more difficult.
The amount of one-shot mechanics hasn't noticably increased either - remember Titan (a story trial mind you) you could actually fall permanently!

So the real problem is that people got too comfortable not being able to fail to the point they aren't even trying. They aren't used to see a game-over screen anymore or stumble or heck even die at least once lol and not they call it "casual game". It really is a visual novel with auto clicker "fights" where you go in/out, left/right, spread/stack.

The only interesting bits this time around that made it "harder" is the encounter started to experiment with new stuff again (something YoshiP and his team stopped doing because of players) so it's nice to see some mini games like the labyrinth sprinkled into your striking dummy fight for once