Why is rubber a commodity and the use of rubber is not so important?

Natural rubber is widely used in industry, agriculture, national defense, transportation, transportation, machinery manufacturing, medicine and health fields because of its strong elasticity, good insulation, plasticity, water and air barrier, tensile resistance and wear resistance. and daily life, such as tires used in transportation; conveyor belts, transmission belts, and various sealing rings used in industry; medical gloves and blood transfusion tubes; rubber shoes, raincoats, hot water bottles, etc. used in daily life are all Made with rubber as the main raw material, aircraft, cannons, tanks used in national defense, and even rockets, artificial satellites, spacecrafts, space shuttles, etc. in the field of cutting-edge technology all require a large number of rubber parts. What concept stocks are there?