I think there is a tendency ( I have it in spades) if you are interested in car care, to over egg the pudding a bit. Layering up protection, very often of different brands, is common. I do it.
I used to follow a much more logical regime when I had less time on my hands. I'd wash the car with Zip Wax or the green Autoglym shampoo and, once a month I'd polish a quarter of the car so, over 12 months, it would get polished 3 times. It looked fine.
My neighbour, a nurse, has just washed her Mercedes 180 at Tesco hand wash. First time in 2022 she proudly told me. Depressingly it looks great!