If the carpool stickers had come with a 20 year guarantee then nobody could reasonably be upset about the rules changing later because “forever” turned out to be too good to be true. This would be like solar, except that they want to change the rules later anyway.
If they simply left the original EV carpool stickers grandfathered but stopped giving out new ones, people who missed their chance would be upset. But the program would have worked exactly as intended, to incentivize early adoption of EVs by giving out a priceless benefit. It should never have gone on as long as it did, but government reacts slowly.
I had a model year 2002 as well, and it went through head gaskets pretty reliably every 30-35k miles. The failure mode wasn’t catastrophic damage every time, but it wasn’t pretty. I think exhaust gases would start getting into the coolant especially when the engine got hot, so I’d be maybe going uphill and notice the temperature spiking. Then I could pull off to the side of the freeway and wait for 30 minutes, start out again and drive home slowly.
Subaru admitted a gasket design fault for something like model years 1998 through 2000, but claimed for a while that everything was fine in 2001 and 2002, jerking me around and generally being awful.
It’s too bad. It was my second car and I was excited for the reputation reliability and capability of a Subaru, but it left such a sour taste in my mouth that I’ll never buy one again.