Even if a GTP-X will be able to get my description of a system and because it understands the industry lingo and practices create a extremely optimized RUST cod

Even if a GTP-X will be able to get my description of a system and because it understands the industry lingo and practices create a extremely optimized RUST code, why would we need systems like apps and webapps (like internet bankings) in a world where we all have access to GTP-X? Like program a KUKA robot to manufacture typewriters in 2023. How "computer systems" will look like?