I'd limit your case to "highly-concurrent environments where want lots of shared, mutable state". There's always cases for some shared or global thing that you

I'd limit your case to "highly-concurrent environments where want lots of shared, mutable state". There's always cases for some shared or global thing that you're transacting with, but I think 99% of code in highly-concurrent environments should be written with message-passing and limited scope at any point in the program.