Rear derailleurs are a wonderful and elegant solution to shifting the chain up and down the range of gears on the cassette. Unless you bump them in to something and bend your hanger, they rarely need adjustment, other than a quarter turn of the barrel adjuster from time to time as cable tension decreases.
But front derailleurs are Satan's spawn. You know why.
That said, I'm
still not going 1x, as I like the flexibility of multiple front chain rings.
