Its been around longer, unbroken in lineage, is more historically important, and has significantly more iterations that give each owner their own flavor. And they wear much more svelte than a Reverso, even if you want a reversing feature.
I don't think its fair to call them a delicate product. They should be able to survive the dings that their size naturally brings on them. I smash my Sub and Panerai on stuff significantly more often than my RL slim.