I’m sure it was plenty. Like almost any deck at that time facing Gideon 1, it was basically a race to destroy Gideon before he put up his invincible hexproof wall.
I never owned Runaway Carriage back when it was broken, but a lot of players did and abused it. My best decks at that time was (just my luck) beserker werewolf decks, so racing to kill Gideon before he became indestructible was not a new experience to me when I tested the Saheeli deck.
My point here is: The problem wasn’t the Saheeli deck, it was Runaway Carriage, which at that time was equivalent to playing this game with cheat codes.
Ehh. It was both. That deck was too top-heavy. If I made that deck ,I would have been able to see that with some QB play testing almost immediately, even if pre-nerf RC never existed.
As long as there is another event running , there is no problem with it. You can still get some rewards without the specific planeswalker. Half of something is better than nothing.