Some places will dismiss a traffic ticket if you attend a driver's education class to get updates, though you can only do this once every few years. So at least there have been some attempts to get people to update their learning.
> No amount of crashing results in traffic school, just certain kinds of tickets.
Well, sufficient at-fault crashing will suspended your license, and among other requirements for restoring the license may be traffic school, DUI school, or some other program depending on the reason for suspension, so this is not strictly correct. You can't use optional voluntary traffic school to clear points from a collision from your record BEFORE getting a suspension the way you can with minor moving violations without a collision, but that doesn’t mean collisions won’t force you into traffic school.
Which states/counties/cities? IME that rarely happens, tickets are often used for revenue-raising. And some recent laws e.g. 2008, 2009, 2025 CA cellphone use laws cannot be discharged by traffic school, AFAIK.