I am by far not an expert on file systems, but I thought that defraging a SSD was not advised as TRIM would take care of this. Trim is supported by most distros, defrag is not supported by most file system types.
Pudge
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Yeah youâre right, SSD is not advised (although TRIM != defrag), i was speaking on HDD behalf - coz wellâŚ
To store some serious data on SSD, say 4 Tb, you have to be seriously rich for no apparent reason 
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Sorry, I guess I didnât make myself clear in my first post.
Currently most OS are installed on a SSD, and as @keybreak correctly pointed out, a lot of people use a HDD for data.
My concern is, does the defrag in BTRFS and XFS take into consideration if the file system is on a SSD and not use defrag? Or does the user has to intervene in a config file somewhere?
Pudge
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Now thatâs a great questionâŚ
No idea here 
I guess yes, butâŚ
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Letâs wait for someone who actually knows that 