Thing is, most Toyota drivers would not be impacted by old/dirty brake fluid—they never drive hard enough for it to matter. By the time its ten years old, most are onto third owner, and just about to be wrecked, I’d wager.
I bought a used LS430 in 2016, when it was almost 10 years old and had 80k. Guess what? I got it home, poked under the hood, AND THERE WAS ZERO COOLANT IN THE OVERFLOW NOR IN THE RADIATOR TO BE SEEN!!!
My mind was racing, blown head gaskets, I got ripped off!!!!!
It wasn't the case. Can you believe this car was dealer serviced its entire life, and NOBODY CHECKED THE COOLANT, EVER?
Because Toyota pink coolant is called SLLC and its first change interval is 10 years, 100k. It was gone from evaporation. That was almost 6 years ago the car never overheated and the temp has always been the same. I'll save it for another day, I got a complimentary multipoint recommending $7k worth of work hahahahahahahahahaha (it wasn't needed again I've had the car almost 6 years)
btw on the 3UZ-FE engine the coolant reservoir window faces backwards--it is viewed from the driver fender, looking forward. Also, in order to get to it, the plastic air intake must be removed. That's why nobody touches it.
But I do the brake fluid myself since it's hygroscopic and would rust the system from the inside out, as well as likely boiling sooner when old.