Speaking of Javelin missiles, mentioned upthread. In 2022, when the war in Ukraine erupted, the small stock of Javelins which the NATO countries were able to provide was spent in like first several months. After that, $300 drones carrying a $1000 armor-piercing round started to dominate the battlefield, leading to terrible losses in Russian armor, especially the newest and most expensive tanks. Similarly, having lost a number of advanced and expensive aircraft, and watching advanced and expensive cruise missiles mostly shot down during airstrikes, Russian forces turned to expendable drones imported from Iran (!) and expendable rockets imported from North Korea (!!).
In other terms, Protoss-type technology works well when you have a large advantage and need to deal a decisive blow; an example would be B-2s bombing the Iran nuclear facilities. But when you're in a protracted conflict against a capable adversary, Zerg-type technology, cheap, flimsy, and truly massively produced, seems to be indispensable.
