test-connection vs win32_pingstatus

Hi, I have  little question to Richard Siddaway's book,  if I may:) .

In "powershell and WMI",  in section "best practise" Richard has written like this:

"Use Test-Connection -ComputerName $computer -Count 1 to test the availability of a remote machine before using WMI."

 

In powershell v5,  test-connection or win32_pingstatus are members of the same class

TypeName: System.Management.ManagementObject#root\cimv2\Win32_PingStatus

 

..so ..or I can understand this paragraphe(test-connection and another class like win32_diskdrive or win32_pingstatus are members of System.Management.ManagementObject#root\cimv2\*) or it was difference in previous powershell version (v3,v2)?  
Why use test-connection before wmi technology sice are members of the same namespaces? 

  • May be it was just suggestion not to reinvent wheel? :)

  • Get-WMI is an expensive call -- read that as SLOW.  It becomes painfully slow when you have to wait to timeout for a machine that's not online when your script is running.  So it's considered a best practice to see if the machine (or address) is alive before trying to connect to it for WMI data.  Not required, it just makes sense from an efficiency standpoint.