As long as champions can gank you undetected, Stealth will NEVER feel "fair"
I'm adamantly opposed to the entire concept of giving high-damage burst characters the power to approach literally unseen. Even Rengar and Eve, who alert enemies to their general presence with a !, still "feel" bullshit when they leap out of nowhere before they can be rooted or attacked.
Frankly, the power of guaranteed First Strike will NEVER feel fair to play against, and removing the power of pink wards is only going to make that worse. The only time in the game stealth felt like it had any counterplay at all was when Oracles Elixir still existed; they couldn't approach you entirely unseen, but the detection radius was so small that there's only a small window of reaction time unless you react quickly. Removing the power to detect invisible enemkies through consumables is only going to make them feel MORE bullshit to play against.