One of the most forgotten/neglected fluid is the Power Steering fluid.
It is good maintenance to suction out the old & install the new once a year!
When it is below freezing, my power steering seems to stiffen up & new fluid will help quite a bit, to keep things moving smoother.
The suction device is available at Wallyworld in the Jerry cans section & quite inexpensive.!
As you can see (after 1 year) the old fluid is a bit dirty ! I'm using Delco GM power steering fluid, that maintains flow as tested from my freezer LOL.

While new fluid would keep the system at optimum working conditions, I have to disagree with you on changing it every year.....

But you are correct, it is one of the most neglected maintenance items out there......

Even by GM.......I looked at my owner'* manual and checked the schedule A and B.......and replacement of PS fluid is not even there......the same for brake fluid......

I think replacing PS fluid every year is a little bit of over kill......but I have neglected it over the years.....I had many vehicles that I kept over 10 years, and never replaced the PS fluid......in the early 90'*, there were some problems with PS when cold, and they recommended changing to this new "cold weather" fluid.....but more often than not, it was the seals in the spool valve that needed to be replaced......maybe if the fluid was changed more, those seals would have lasted longer.....that was not a fun job replacing those seals....

The only real times that I would replace PS fluid, was when a rack or pump was replaced......The way I use to do it, I would disconnect the return from the pump(plug the opening), and add a hose to it and put the end in an empty gallon jug......then I would have someone start the engine, and I would keep the reservoir full with fresh fluid I poured into it as it ran.....when the return fluid was clear, I would have the engine turned off....

But it is a good idea to replace it, to remove the crud that builds up in the system, and to keep seals lubricated.....

As to how often it should be done? Debatable......What say you Forum? Every year? Two? Five? Ten?

If I were to buy a used vehicle with that system, it probably would be a good Idea to replace the fluid.....it'* almost a moot point today, with electrical steering....

The one fluid that really gets neglected, I feel, is brake fluid......I have never seen a scheduled maintenance for that fluid either......and the one fluid that is completely neglected, is coolant, which does have a maintenance schedule......which I feel should be changed more often than what the schedule calls for.....Transmission fluid is a close second to coolant....

I've Changed the title to now also include brake fluid as well, It is scary that no scheduled maintenance is stated regarding brake fluid.
Here is an interesting read link: https://www.bluestar.com/get_informe...of-brake-fluid
Quote from above link:"Brake fluid should be tested for water and copper content. Electronic testers and test strips are commercially available to measure both moisture and copper content.
The corrosion inhibitors in brake fluid degrade over time. Degraded inhibitors in conjunction with the presence of excessive water cause corrosion in the braking system.
After only a year of service, the brake fluid in the average vehicle may contain as much as two percent water. After 18 months, the level of contamination can be as high as three percent.
After several years of service, it is not unusual to find brake fluid that contains as much as seven to eight percent water."

Even though my brakes were rebuilt 3 years ago,and 60% pads remain with working calipers, I decided to currently suction out the master cylinder of the old DOT3 to help.
I am glad that I did. The pedal was much more firm! In the spring, I am going to bleed all 4 corners with new DOT3 brake fluid!
Here is the quality brake fluid that I used to refill the master cylinder with..

Many may not realize that there are makings for MAX & Minimum levels on the master cylinder, & ensure you refill to the previously marked level before suctioning out the reservoir.