Touch isn’t about design or fashion so much as it’s a cheap way of not having to design or assemble any physical interface at all. A full set of physical switches is a huge amount of cabling, switches that can break, a lot of assembly time.
Want to add a button only available on the 4WD model? Then you have to have a blank dummy button on all other models, or two designs. Want to add/remove buttons on the next model year? Adds a grand to the cost of the car and the physical layout must be done 6 months before production starts.
Touch solves all of these problems. It’s super quick to install. Easy to adapt to different models and between years. Few things that can break.
The downside? Useless when driving. Tesla easily accepts this tradeoff, and will likely continue to do so.