nealrichardson commented on PR #13210:
URL: https://github.com/apache/arrow/pull/13210#issuecomment-1138531323

   > are we sure that preserving them is worth it?
   
   The short answer for why we do this is that people expect to be able to save 
a data.frame to a Parquet file and get the same thing back when they load it. 
Pandas took a similar approach (attaching metadata to the schema).
   
   The probably longer answer is that I'm not aware of `vctrs_extension_type` 
and what it does or does not do. Maybe some of this can be dropped (though for 
backwards compatibility, not entirely dropped yet). That said, I suspect that 
doesn't cover everything because I get failing tests without this code. 


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