The impact of bugs is minimized by compartmentalization. This is done from the lowest level where each data structure is separate and immutable [1]

But you can simulate mutability with stateful processes.

Directly from Joe Armstrong: https://joearms.github.io/published/2013-11-21-My-favorite-e...

[1] https://github.com/happi/theBeamBook/blob/3971e8e2d09e367670...