I wasn't referring specifically to the physical aspect with something like colocation, although that's another potential facet of complexity. The complexity I

I wasn't referring specifically to the physical aspect with something like colocation, although that's another potential facet of complexity. The complexity I was referring to is literally having two distinct environments interoperate seamlessly. You now have one environment trying to talk to a database in another location, for example. So, some requests are artificially slower than others. You could mitigate that with caching, and probably already do, but now your cache is fragmented across two, or more, environments. On and on and on and on. Configuration, security, duplication of resources that can't be easily shared. These aren't unsolvable problems, but they're relatively more complex than sticking everything in a single environment. And yeah, the money aspect could easily be worked in either of our favor. It really depends on the specific situation.