I think most organizations should take a stab at scaling out with in-process services first - ie, instead of an rpc it's a function call, instead of a process, it's a module, etc.

In a well-factored app, stepping on one another's toes should be the exception, not the rule.

Unfortunately, I think modern web frameworks don't do a good job of enabling this. They often encourage "God object" patterns and having code/data very tightly coupled.