And yet it meets the key requirement: it's up and running, stable, for years, growing and (presumably) profitable. Sure, they could scrap the whole thing and r

And yet it meets the key requirement: it's up and running, stable, for years, growing and (presumably) profitable. Sure, they could scrap the whole thing and rewrite it in Grails, and add Rabbit 0.3 to make it run faster, but why scrap a working, stable profitable stack in pursuit of some shiny bauble?