Hello rosna
By default, all ports on a switch, including those configured with portfast SENDBPDUs. (It is possible to disable BPDU sending on these ports using BPDU filtering.) Portfast essentially skips the listening and learning states to enter the forwarding state immediately but does not disable STP. It also applies the global BPDUGuard feature (if it is enabled) to all ports configured using portfast.
In addition, as you mentioned, it won’t send any TC information on that port because by definition, there should be no switches connected to the specific port.
The reason we use BPDUGuard is because we don’t want any switches to be connected to a port configured with portfast. It is only for end devices. So if a BPDU is RECEIVED, the port goes into err-disabled state, essentially shutting down.
I hope this has been helpful!
Laz