I'd think you're more likely to introduce contaminants or leaks into the brake or power steering fluid system than needing to exchange the fluid. Is this really a thing? Maybe with "modern" fluids? Most of that crap is stupid simple or sounds like someone crawling underneath (maybe) and checking off a box that it looks good.
I will never have a transmission "flush" again. I've finally figured out that that is what has actually ruined two transmissions I've had on different vehicles at different points in my life.