ETL Fast Food
Have you ever thoughts about ETL like a Fast food restaurant... Instant prepare "Extract" of data, quickly serve "Transform" process, well-done implement the "Load". Sounds like yummy burgers and french fries.
Cooking a home ETL is time consuming, especially when you factor in all of the additional time it takes to prepare, like going to the "grocery store" to get the necessary ingredients...
ETL can be Fast Cheap and Convenient, but never lead to " excess weight" "health problems," "poor food quality” ;)