Indeed. They are too small to make big difference.
I have them on my '17 CX5 (installed DIY), and decided to skip them for my '22.
Personal opinion, of course.
Nope. Left them on car. I've done several the same way over the years. Prep is key and having the time to do it. Usually takes me a full day. OIl chainge, rotate wheels, clean wheels while off and paint calipers.