I agree that plastic materials have become stronger and lighter. Btw, by using a novel polymerization process, MIT chemical engineers have created a new material that is stronger than steel and as light as plastic, and can be easily manufactured in large quantities. The new substance is the result of a feat thought to be impossible: polymerizing a material in two dimensions. The new material is a two-dimensional polymer that self-assembles into sheets, unlike all other polymers, which form one-dimensional, spaghetti-like chains. Until now, scientists had believed it was impossible to induce polymers to form 2D sheets. Such a material could be used as a lightweight, durable coating for car parts or cell phones, or as a building material for bridges or other structures, according to the published report back in February 2022. So, in theory, it could also be used as a coating for keyboard housings to make them strong as steel and lightweight and perhaps impervious to dents and/or scratches. The researchers found that the new material’s elastic modulus — a measure of how much force it takes to deform a material — is between four and six times greater than that of bulletproof glass. They also found that its yield strength, or how much force it takes to break the material, is twice that of steel, even though the material has only about one-sixth the density of steel. But it'll probably be a while before we would see something of this nature used in keyboard housings. Nevertheless, it's quite a breakthrough in the manufacturing process going forward.
All the best, Mike