Earlier quoted context omitted.
It's not exactly hard to imagine what problems occur here. You spend a huge chunk of your life saving to buy a home, and you plan it so that you can pay the taxes on it when you retire, then the rest of the city forces you to "enjoy" higher taxes you never demanded, predicted, or wanted, based on an income stream that you no longer have to pay it with, suddenly driving you out of the home/neighborhood/town you worked…
What’s really unfair is someone whose home goes from $100k to $2M, for a total capital gain of $1.9M gets a 90% discount on their property taxes. The people with the greatest ability to pay are the ones getting the biggest tax break.
They don't necessarily have any ability to pay, which is the scenario that brought prop13 to life in the first place (low-income grandma kicked to the street by taxes).
Someone of modest income who bought a modest 100K house years ago isn't cash-flow rich today just because the paper value of their house went up. They are probably retired living on a small social security check and don't have much any ability to pay, let alone the "greatest ability".
It's fine to have different views on how society should handle this tricky scenario, but let's be intellectually honest with the core facts.