Deafault loggin users SQL

We have disabled login user Sa in SSMS and created different user to access Sage 300 databases, Our auditors asked us about the default logging users created when you install SQL. What's the best practice to deal with those users created during SQL installation. find below

##MS_PolicyEventProcessingLogin##
##MS_PolicyTsqlExecutionLogin##
MyServer\Administrator
MySqlAuthUser
BUILTIN\Users
NT AUTHORITY\SYSTEM
NT SERVICE\MSSQLSERVER
NT SERVICE\SQLWriter
NT SERVICE\Winmgmt
sa Disabled