This is a silly take. You can learn to build an LLM, there are great resources to do so (there are books about building them from scratch), you can use older model GPUs or rent them by the hour. The value of understanding them is really high for anyone building any application that uses an LLM at any point.

It similar to understanding how a very basic CPU works. Just because I'm not going to work at intel or nvidia or whatever optimizing the hell out of a chip, it doesn't mean I just throw my hands up and think "magic" - the basic architecture isn't that difficult, and the value of knowing it is astronomical for anyone writing software.