It's not just that touch interfaces are cheaper. It's that you can decouple the interface design and feature set from the manufacturing schedule and shorten the overall development.
1 may be one the same button as cruese control
2, 5 may be on shifter knob panel
3 and 4 are the only new buttons on steering wheel
2 I've usually found in the buttons near the shifter
3 I'm not sure what you're referring to? If it's the little screen generally between the speed and battery/rpm display those controls are usually on the steering wheel in my experience.
4 Steering wheel, in every car I've seen it in and that's often standard across the models
5 This one I've only had one experience with and that's my wife's Kia Niro EV and those are on what would be shifter paddles in a car with a gear box.
The number of buttons on steering wheels between my decade old gas Golf and my wife's few year old Niro EV are shockingly similar though presented and arranged differently. Both have 4 buttons and two directional pairs (audio control for skipping on one, volume on the other, cruise control speed on another and one dimension of the hud paging on the last) though the Niro has the pairs as rocker switches that can click for one extra button I suppose.
I think of an initiative GM had, I think circa 2000, to standardize branding across all their vehicles and notably use the same buttons from the bottom of the line compacts up to flagships like the HUMMER, Cadillac, and the GMC Suburban. Sensitized by media coverage whenever I looked at these buttons sitting in a GM car or looking through the windows I felt that it diluted the higher end brands.
Automotive hardware is extremely difficult to get right. Buttons are a solved problem. Touchscreens are getting there. Everything else is a gamble in an area where failures have huge risks. OEMs don't like those. We'll probably continue seeing haptic feedback on things like wheels and shifters, but haptic touchscreens seem to be on the way out these days.