The extra depth is sometimes quite useful to be honest. I've been grateful for it when I've hired a rug doctor (although it fits at the higher level, it rattles about and occasionally taps the rear window).
That said, I've crammed loads of other stuff around the spare wheel (proper wheel brace, compressor, etc.) so it stays in the higher position now anyway. If i ever need the extra depth, 2 minute job to remove the other stuff.