Good info and that explains it. It's been 20 years since I did a brake job and I can't recall the last time I put tires on a personal vehicle (company car gets them as needed - it's driven a lot more). Hell, my '20 with 182k miles still had the original brakes on it (I think 3 sets of tires though).Most don't, but it should be changed at least every 5 yrs. Brake fluid is hydroscopic so it readily absorbs moisture & humidity and in Indiana with it's high humidity summers, can be a lot. This will cause rust inside the system, caliper pistons/cylinders will bind, steel brake lines rust from inside out, etc.
I try to flush the system every 3-5 years.
But, I can't think of a car I've had longer than three years... so I'm usually just oil and filter changes.
Kind of boring, as I used to enjoy wrenching...