How about add a function "replay" on client ?

I'm new player in PBE. I have searched about the "replay", but the discussion are all posted by 2 years ago. And I didn't find any function about replay on client. I have use some third party application like "MKlol" before. The main reason I use "MK" is that it can save a game on computer as file. It's helpful to know how good we have play and how many mistake we have done. I like watch the replay very much. Now third party application is not allowed to use. Why not think about to add the function"replay" on client? Players can choose save the file or not. My English is poor, thanks for reading.
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