XF 2.0 Custom thread field in post replay?

I am not sure if it is odd.
Why would you need custom thread fields in replies?
Let's say you have 1 thread with 100 messages. You want 100 fields in all of these messages? Why?

Having custom thread fields (so only for the thread itself) is a better way to organize information.
 
how to add some styled frame around custom field in thread something like this, it is possible in extra less?

post-png.169803
 
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