Sim, você certamente pode desativar o PowerShell 2.0 e você deve.
Instruções de: link
Fix Text (F-76869r1_fix)
Disable "Windows PowerShell 2.0" on the system.
Run "Windows PowerShell" with elevated privileges (run as administrator).
Enter the following: Disable-WindowsOptionalFeature -Online -FeatureName MicrosoftWindowsPowerShellV2Root
This command should disable both "MicrosoftWindowsPowerShellV2Root" and "MicrosoftWindowsPowerShellV2" which correspond to "Windows PowerShell 2.0" and "Windows PowerShell 2.0 Engine" respectively in "Turn Windows features on or off".
Alternately:
Search for "Features".
Select "Turn Windows features on or off".
De-select "Windows PowerShell 2.0".
Blog de desaprovação do PowerShell 2.0 da Microsoft: link
We do not currently have a timeline to remove Windows PowerShell 2.0, but as we continue to evaluate its usage in the PowerShell ecosystem, we will be working to remove it in a future release.
O PowerShell 2.0 será completamente removido no futuro, mas ainda não há cronograma para isso.