Because of inflation, you need to keep earning because past earnings lose value, and you need to replace the lost value.

So they need you to replace your products frequently so you buy again and again.

It is easier

- to make shitty products, so you HAVE to replace aka planned obsolence,

- then making better and better quality products, so you change because of utility and quality.

planned obsolence >> competition

Just my 2-sat version.