Readonly structs as component data

I have seen people using readonly structs and readonly fields in their component data structs.
Does it make a difference?
What are the pros and cons of using readonly structs (or readonly fields in a normal struct)?

 

from what I gleaned it allows asynchronous process to use the same data without queuing , as in the case when different threads write to the same data where it has to be done in some order.

 

So basically it's same as adding [ReadOnly] attribute to the parameter in job?

 

It's just to assure that those components are immutable. Immutable objects have lots of advantages. I use it whenever I can.