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It's time to drop support for Windows PowerShell, and move to PowerShell 7. Yes, even if it doesn't yet ship in-box with Windows Server. Just install it by default - you can still use WinRM, no need to switch to SSH. .NET Framework is *ancient* and lacks a decade of improvements

One catch on the WinRM half: if WinRM is already enabled, PowerShell 7 uses the existing Windows PowerShell 5.1 endpoint Microsoft.PowerShell for remoting, per Microsoft Learn. Running Enable-PSRemoting under 7 is what gives it its own endpoint - otherwise your remote sessions still land in 5.1.