The reason P-tex bases are used is partially because of
their ability to hold wax and to flex without breaking.
Example: Sintered base skis, waxing them regularly and maintaining them will give you a faster ride. Also they are repairable with melting P-tex into gouges to help with longevity.
It may be a softer less durable material, but it will be hard to find a material durable to take the weight of a skier sliding over rocks, logs, and rails which usually create the gouges.
Sure there could be a better option out there, but that material may be too expensive and also may not slide well on snow/hold wax. So it’s definitely more complex than just durability.
Search: "Sintered bases vs. Extruded bases" and you will get a ton of information.