In both cases it's a cost/finance reason. "Smart" TVs can profit from selling customer data and touch screen cars save some cost over tactile interfaces.
Everyone always says this, but how much do they actually make per unit sale. I buy $2k+ TVs, are they making $50 off of my data, or $5? Does it even pay for the department they hired to write the software that collects the data?
Same for car. It's hard to imagine manufacturers would care to reduce cost by $5(20 tactile buttons likely costs lesser than that) on a $10k car, but what would I know.