For some values of well. If you logon interactively and start a powershell session, you do not have administrative powers and cannot get them without opening a new shell. If you logon via PS remoting, you have administrative powers by default and cannot lose them.
UAC is a GUI kludge, and is very grating especially in Powershell.
You can create hard and soft links. PowerShell is great, just different. UAC is not sudo, but works very well. It's a different OS.