Microsoft 365 PowerShell is not a single entity. Rather, it spans a mixture of workload-specific modules and the Microsoft Graph PowerShell SDK. Developers must decide what modules to use when creating new scripts. Should they use a workload-specific module like Microsoft Teams or the Teams cmdlets from the Microsoft Graph PowerShell SDK. It's hard to decide, but sometimes you can get better performance or other advantages by settling on one of the options.
https://practical365.com/microsoft-365-powershell-confusion/
