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How to write update with best practice?

I work on SQL server 2014 I need to rewrite update statement with best practice
CAN I Write it without subquery ?

SET  FamilyGroup = STUFF(
SELECT   DISTINCT '|' + CAST( ISNULL(REPLACE(f.FamilyGroupText,'|','/'),'NULL') AS NVARCHAR(50))
FROM ExtractReports.dbo.MultiMask FF 
INNER JOIN Parts.Nop_Part ptt WITH(NOLOCK) ON ptt.Masked_ID=ff.Masked_ID AND ptt.Masked_ID = FFFFF.Masked_ID
left JOIN [Parts].partscrubbing LC WITH(NOLOCK) ON ptt.PartID=LC.PartID
LEFT JOIN  Parts.ZFamilyGroup f ON f.ID=LC.Generic_3
WHERE ff.Masked_ID=FFFFF.Masked_ID
        FOR XML PATH ('')
FROM  ExtractReports.dbo.MultiMask FFFFF

Whats wrong with doing it with subquery?