You spend too much time in or on all of these things to be uncomfortable.
I also see posted here the Adam Savage advice of buying cheap tools first, and then upgrade after you better understand your needs. I also think that's great advice you can apply to most things. Just not the above things.
Yeah, I was thinking tires instead of car seats. This used to be the three things we spend most of our day on, which is mattress, tires, and shoes to keep your back from going out and keep you safe on the road. If your car seats are messing up your back you need a new car.