Partially, although the decreasing quality of products is a real phenomenon under capitalism. A factory owner could make sturdy goods with high quality material... but they can save costs with less material, or a lower quality substance. Plus, there's more return customers the shorter the lifespan of the good. When goods become worse because of cost cutting or because the manufacture can't keep up with cheaper-yet-worse competitors, that's called market obsolescence. When capitalists deliberately shorten a good's lifespan to increase returning sales, it's called planned obsolescence.