While the initial rework 'experimentation' was an obvious failure, I believe it was BECAUSE of the added utilities, hence why they needed to take those away.
Also, I wouldn't make everything sound like a stat check; there's a slippery slope there. I could just as easily say any sticky character with a low cd dash or spammable slow is a stat-check because 'all it does is force the opponent to straight-up fight them in a stat-check match, or let the user escape such a stat-check match'.
The point about fizz lee sin etc being the opposite reason is exactly my point. Once you start adding utility, the balance immediately becomes questionable because you need to value that utility and what the appropriate tradeoff is when it comes to balance, how much more utility you can add etc, and that's not something the balance team can handle when they constantly make changes to the game.
I also still think the balance of the Morde rework is much better now than it ever was before. I actually don't get why so many people view the rework as a COMPLETE failure; while he's now more feast/famine, some of the main issues (that I mentioned) that the rework DID solve is the oppressive e-spam, as well as shield scaling and adding weaknesses. While it did add other problems, you cannot deny that pre-rework, if he was good, he would have no counters and never die (which is why he was left in a weakened state). Now he has counters, and he wins certain matchups instead of all matchups, which is an appropriate balance state. He's even still competitively viable now, after all the nerfs and changes. Not quite a weakened state, considering how hard he can stomp when played well in all elos. You can't say that much about pre-rework, that's for sure.