The most important interactive part of WOZ is much more satisfying than on TSPP - the flippers.
And why does the game need more ramps? There are already plenty of rampfest games.
And what do you think the UL toy was meant to be?
TSPP is great, but almost entirely because of the rules. With rehashed rules it would be just an average (at best)game. Like TSPP, WOZ has interesting rules.
This is also why AC/DC is great. Without the LFS rules, the game would not be beloved by players. A flowy game with fun shots does not equal a good game. For example NF - flowy, fun jump ramp, but terrible rules.

If you don't find the three skill shots with the middle right flipper satisfying, or hitting the "R" target off of the witch with that flipper, then alright, the shots are not to your liking.
Upper flipper loop shots like TS, BK2K, Getaway, Congo, Whirlwind, JD have been done to death. And some of them (like the shadow loop) would be very hard to improve on.
And there are tons of games with upper flipper ramp shots. It has been done so many times.

I have no problem with the castle playfield. The ball gets captured, then you play that playfield to rescue it. Why should the castle hold a bunch of balls? Dorothy gets captured, then you rescue her.